Saturday, November 10, 2012

Myths, Tales & Facts About Birds


Learning about birds has made me realize the vastness of the information surrounding these diverse creatures.
 Cock Pheasant--What is a gathering of this bird called?—Read on…)

It wasn’t until I started working at the World Bird Sanctuary that I learned that the people who watch and observe birds are called birders and that birding is the field activity of observing birds. So for this blog, I thought I might put together a collection of what I believe to be some interesting myths, tales and facts about birds.

Common bird myths.
You might believe birds only sing when they’re happy. However, most male birds use singing as a form of aggression to warn off competing males or to indicate their unique qualities to attract females. Also, males with more complex songs or who sing more often tend to be preferred by females.

Secondly, there are birds considered to mate for life or be monogamous, but “divorce” is something common for almost all birds. Most birds will live with their partner for just a few months or years with divorce ranging from high in the greater flamingo to never in the wandering albatross. Most songbirds in North America often “cheat” on their mates with DNA paternity testing showing that cheating results in 40% of the young in several species.

You may believe two bird parents are required to raise their young, but in birds such as the hummingbird or woodcock, only the female will raise the young. Also, other birds such as crows and blue jays recruit nannies--often former offspring--to help support and protect their young.
 Turkey Vulture--One of the few birds with a well developed sense of smell

The last myth I will mention is that birds have no sense of smell. Certainly, most birds cannot smell as well as a dog, but there are seabirds that recognize their mate using smell alone and a turkey vulture will find its meals by sniffing the odors coming from dead animals or carrion.

Here are some Interesting “old wives’ tales” about birds.
One superstition states that a wild bird trying to fly into a home or hitting a house widow represented death in that household. The ill luck associated with this superstition could be extended to include having a pet bird or even the image of a bird in your home.

 Another interesting bird tale is why an artist's last work is commonly called a swan song.  European Mute Swans are relatives to the North American Trumpeter Swan and a legend from ancient Greece tells that right before these swans die they will burst into a beautiful song. Greeks believed this represented a celebration of the bird's joyful departure to join the god of music, Apollo.

Interesting Facts
I found interesting terminology used for birds, and what struck me were the many names given to the gatherings of certain birds, which happens to be a long list including:
*            congress of crows
*            parliament of owls
*            sord of mallard
*            paddling of ducks
*            gaggle of geese
*            muster of peacocks
*            stand of flamingos
*            watch of nightingales
*            murmuration of starlings
*            exaltation of larks
*            nye of pheasants
*            covey of quail

If you ever wondered if there were names for a birds diet, here are the terms related to what a species of bird consumes;
*            granivorous (birds that eat grains or seeds)
*            frugivorous (birds feeding mainly on fruit)
*            insectivorous (Birds that eat mainly insects)
*            nectivorous (birds feeding mainly on flower nectar or juices of fruits)
*            piscivorous (Fish-eating birds)
 Baby Robin--Can you guess which of the above diet terms would apply to this little guy?

Above is a picture of a baby robin which I was lucky enough to catch a close picture of in my own birdingJ.

Of course, there is a multitude of even more interesting and curious information out there about these amazing animals. I hope you enjoyed these tidbits enough to do some exploring on your own.

Submitted by Whitney Cowan, World Bird Sanctuary Grant’s Farm Seasonal Supervisor

Thursday, November 8, 2012

What Are Field Studies?


Beautiful country fields, miles of tall grass in the middle of what feels like nowhere, and a hot 89 degrees in May doesn’t stop World Bird Sanctuary’s Adam Triska from doing his job.

Field Studies are an important part of the research the World Bird Sanctuary does. In fact, it is one of four ways we fulfill our mission statement.

What, you may ask, are field studies? In WBS’s case, Field studies can be defined as: a company (World Bird Sanctuary) which is contracted by another company (in our case Ameren Missouri) to see whether or not bird habitat is healthy.  WBS does this through various surveying techniques. 
 Power line stanchions 
From March through August 2012, Adam monitored 240 nest boxes on Ameren Missouri power line right-of-ways and recorded the birds’ success rates that nested in those boxes. The boxes are mounted on the power line stanchions.  You might be wondering what a stanchion is because I certainly did!  If you look at the photo above, you will see what might be a familiar site when you are driving on a highway--a big wide open space in the middle of nowhere with large structures holding up power lines.  Those structures are called stanchions.

On May 24th I got the chance to go along on a field studies trip.  Adam’s field study days are always to different places.  There are three lines and 240 nesting boxes that he looks after on a daily basis. 
 House Wren Eggs 
The day that I went with him we went to quite a few different spots and checked on some eggs he had seen the previous week.  This particular line of nesting boxes is a new line for this year’s study, near Robertsville, Missouri.
 Banding a baby House Wren 
The first place we went had the most birds of the day, with nesting House Wrens and Bluebirds. There happened to be three baby House Wrens just old enough to be banded.  Banding is something we do to start a record for that particular bird.  If the band is ever found again, data and circumstances can be compared and we learn something about that bird and probably that species.  It is the equivalent of applying a bracelet which is what you see being done in one of the other pictures.

 The opportunity to go out in the field and see this firsthand was a great experience. The work that World Bird Sanctuary does with field studies is very important to not only the bird’s habitat but the environment we live in.

Submitted by Kaitlin Conti, World Bird Sanctuary Intern

Tuesday, November 6, 2012

Bald Eagle To Fly At Hockey Game

Mark Tamar the Vice President of Entertainment and Event Marketing for the St. Louis Blues Hockey Club visited World Bird Sanctuary recently and talked with WBS staff member Trina Whitener.
Mark Tamar, Vice President of Entertainment & Marketing for the St. Louis Blues Hockey Team
Mark had visited World Bird Sanctuary with his family on previous occasions and liked our displays, birds and the WBS mission which includes educating the public about these magnificent birds.  Mark and Trina got to talking about Blues Hockey and the possibility of having an Eagle at a Blues Hockey Game.  Trina is so passionate about Blues Hockey and knows the capability of our birds and our staff.

Subsequently, Trina talked to our management about having an Eagle at the Blues Game.  Many of our staff are passionate Blues Hockey fans, including me.  As a side note--I've been a Blues fan since 1967 when the Blues were an expansion club in the National Hockey League.  My dad split a season ticket package with three other men and I was able to go to 2-3 games a year.  What a treat for a 7 year old boy!!  I am still an avid Blues fan to this day.

World Bird Sanctuary management approved the idea of having a Bald Eagle at the Blues game for the National Anthem.  Mark and our team wanted to make it even more exciting by flying the Bald Eagle during the pre-game ceremony.
WBS Director Jeff Meshach, Mark Tamar, and WBS's Flying Eagles Team members discuss strategy
Roger Wallace, the head Eagle trainer, was consulted and he chose the Bald Eagle named Clark.  Clark is the Bald Eagle who is "all business"--no circling around to make the flights more dramatic.  Roger Wallace, Director Jeff Meshach, and the rest of our flying eagles team met with Mark Tamar at the Scottrade Center and viewed all the plexiglass and support cables holding up the protective netting and the Jumbotron.  Roger knew then that he must choose Clark--the straight flying, no nonsense, get from here to there quickly--Bald Eagle.
WBS Director Jeff Meshach, and Roger Wallace (not shown) checked out overhead obstacles
To make the event even more meaningful, Mark Tamar wanted the Bald Eagle to be at the game closest to Veterans Day; and so it was planned for November 10, 2012.

World Bird Sanctuary received the VIP treatment with special parking close to where the players park and where the Zamboni (ice resurfacing vehicle) is kept at ice level.
Naturalist Trina Whitener and Head Eagle trainer Roger Wallace surveying the venue
We had a pre-event meeting to see where and how the Bald Eagle would be escorted onto the ice.  Roger Wallace put ice crampons on the bottom of is shoes so that he could walk across the ice from the Samboni chute to the penalty box, where Roger would release the Bald Eagle to Trina Whitener.  Trina was stationed close to the Blues goal and goalie.

After the pre-ceremony eagle flight meeting we all went to a dressing room for entertainers--a Green Room so to speak.  This room was equipped with giant mirrors, large countertops, comfy chairs, and a TV to watch the Blues pre-game broadcast.  Mark Tamar told us when he would come to get us for the Eagle flight.  Everything was planned down to the exact minute.

Roger Wallace and Trina Whitener received official Blues jerseys from Mark Tamar to be worn during the event.  What an awesome gift!  I know Trina was in heaven, since she is a lifelong Blues fan and an ardent Naturalist.
Roger Wallace, Clark the Bald Eagle, and Trina Whitener ready for the big event
You will have to tune in to my next blog to see how the event turned out and to see the next set of exciting pictures.

Submitted by World Bird Sanctuary Naturalist/EEC Supervisor Mike Zieloski

Photos by Mike Zieloski

Sunday, November 4, 2012

Fall Snake Count


At the end of September WBS Naturalist, Trina Whitener and I, accompanied by several of our volunteers, participated in a fall snake count.

The data we were hoping to collect is for the Center for Snake Conservation, a non-profit organization based in Colorado.  Their mission is to promote conservation of snakes and their natural ecosystems and implement positive change in human attitudes toward snakes.  The count, which happens in the spring and fall, will give North American citizens the opportunity to lend a hand in snake conservation.

What I mean by snake count is that we walked the WBS property and documented the snakes we found.  The beginning of the day was a tough hike through the hills with only two snakes to show for our efforts.  However, I am glad to report that the remainder of our day met with more success!  We didn’t call it quits until ten o’clock that night, but what a day at work!
Three Toed Box Turtle
We started our day at around 8 A.M. and wanted to focus our efforts on the upper site, or the opened to the public portion of the property.  We devised a plan to spread out in a line and walk the woods, looking under logs and into rocky outcrops for any snakes hiding out there. Well sad to say for the first four hours we still did not have one snake recorded, but I did find a beautiful three toed box turtle basking in the morning rays.

As we approached our property line where it adjoins Lone Elk Park we headed towards the outer road to a rarely used parking lot to see what we could find.  We didn’t find anything until we were heading back to the WBS entrance.  Suddenly, from the side of a large boulder there was a flash of color, but before I could react the snake was gone.  As if on cue, from the other side of the boulder an Eastern Garter Snake darted to the nearest cover!  Two snakes on one boulder!  I had the feeling then that our quest was about to heat up!

In the afternoon we set off to the behind the scenes area of the WBS property.  The lower site is in a valley basin adjacent to the Meramec River—good habitat for any reptile or amphibian.  When we pulled up I suggested that we walk around the buildings while we waited for the rest of our party to arrive. 
Yellow Bellied Racer, a common non-venomous snake in Missouri
The first spot we checked was one of many sheds that had some old tarps on the side. Sure enough, when we moved the first tarp an Eastern Yellow Bellied Racer came roaring out towards the shed!  Once again the snake was gone within a blink of an eye.   Luckily Trina, who is one of our go-to people when it comes to snakes, identified the snake without missing a beat!

Soon after that we checked behind the breeding barn by a bunch of ladders, and out of the corner of my eye there was a tail sticking out of the leaf litter!  I snatched it up and pulled out another racer!  This was the first big snake that we got the opportunity to handle and take some pictures, so it was an extra special find for me.

The last place we checked before the night walk was the hillside behind our Education Training Center.  I pulled out my compass (that’s on my phone) and headed towards the nearest southeastern facing ridge.  This is a known hotspot for snakes on most any mountain, so that’s why I decided to head that way.  There at the top of the ridge was a massive Black Rat Snake sunning its self in the afternoon rays.  I called the others around and warned them to walk slowly towards this beauty.  We circled the snake to cut off any escape routes, and I moved in for the grab.  It was as simple as it sounds to catch the beast! Little did I know until my hands were on the snake that it was still cold, so the snake was very lethargic and easy to handle.  We tried to get our hands on any snake we saw so we could get measurements for the count.
A Copperhead, one of only three venomous snake species found in Missouri
During our night search Trina and I walked the train tracks and found the best catch of the day!  Little did I know that it would be directly under where I was walking! There it was, in all its beauty, an Osage Copperhead!  A great find for an ending to an amazing adventure at WBS!

Submitted by Adam Triska, World Bird Sanctuary Field Studies Coordinator

Friday, November 2, 2012

It Started With The Humble Chicken


In this blog I wanted to write about my experience with birds, which actually started with the humble chicken.
 Me interacting with my chickens 
I’ve been around chickens since I was about 4 years old and my parents can attest to how I would treat them as my pets. I would carry them around the house and sit them on their back, often leaving them that way, but hey I was littleJ. One of my chores growing up was to manage the chickens. I didn’t see this as a chore, though, as I enjoyed just being around these birds. I learned that chickens could be seemingly very affectionate, which may surprise people.

Growing up with chickens taught me the power of imprinting on young birds, which means they recognize their caretaker as their mother. I raised several chicks to adults that would literally chase me down if I didn’t pick them upJ. I loved watching my chickens sunbathe or take dirt baths. Dirt baths become really hilarious if there are several chickens and they all keep kicking dirt into each other’s faces, but I don’t think they mind. Chickens were believed by Darwin to have originated in Southeast Asia from the red jungle fowl. People may be amazed at the wide variety of chicken breeds, comparable to the variety seen in horses, cats and dogs.

When I was eight our father brought home an emu. These were the most exotic birds I had ever seen; large and sometimes aggressive, but they did a great job of protecting our field from predators going after our goats. They are considered a pest of agricultural land in Australia, but apparently have a variety of uses including meat, hide used for leather and their feathers and egg shells are used for decorations and jewelry. People also use emu oil for both cosmetic and pharmaceutical uses.
 My parakeets, Blue and Odette
My experience with parrots began when I was 13 years old and I got my first parakeet named Blue (very original, rightJ). Later I got her a friend; a white parakeet called Odette. I always enjoy listening to my parakeets carrying on a “conversation” that always brightens the room.
A juvenile Red-Shouldered Hawk--my first encounter with a raptor before I worked for WBS
I’ve had a few run-ins with wild birds. I’ve been known to rescue baby robins before they could be discovered by our cats and dogs. I actually saw a raptor up close for the first time a few years ago when my father brought a juvenile Red-shouldered Hawk out from the rain. He looked stunned due to the hard rainstorm we had. After the hawk regained his senses, my dad released him near where he had found him. This was a pretty amazing encounter to me since I had never seen a raptor before then.

Of course, working for the World Bird Sanctuary has really changed that and showing people the wide diversity in birds of prey has been an amazing experience.

Submitted by Whitney Cowan, World Bird Sanctuary Grant's Farm Supervisor

Wednesday, October 31, 2012

Really Weird Birds Part 7


During our education programs about birds of prey, we tell the audience that most birds do not use their nose to find food, but their excellent eyesight and hearing.  There are some exceptions, however. 

Turkey Vultures have an excellent sense of smell, allowing them to find dead animals that may be under trees and bushes.  Another bird that uses its nose to find food is the Kiwi, native only to the forests of New Zealand.
The kiwi is the national symbol of New Zealand.
 There are in fact five species of Kiwis, which I was surprised to learn.  Two are considered vulnerable, one is endangered, and one is critically endangered all due to the substantial destruction of their habitat and invasive mammalian predators.  These predators include possums, stoats, and domestic cats and dogs, all of which were introduced by humans. 

The Kiwi gets its name from the Maori imitation of its cry.  The Kiwi is truly a unique bird and has several interesting characteristics about it.  At a glance, they have a long narrow beak, no tail, large feet, and have little wings that are hidden by their coarse, bristly, hair-like feathers. 

The Kiwi is the only bird that has nostrils at the end of its beak.  They have a very well-developed sense of smell which they use to find insects, grubs, worms, and other invertebrates underground.  They will drive their long beak into the ground to catch them.  They will also eat berries and seeds off the forest floor.  

These mostly nocturnal birds are flightless.  Their one-inch wings are useless. They also lack a keel (bone for attachment of large flight muscles) on the breastbone, and have tough, thick skin.  All are adaptations for terrestrial life.  They don’t have hollow bones either; they have marrow inside them like us.  They do have very strong, muscular legs, which make up about one third of their weight.  Despite its small (adults are about 15 inches tall) and awkward appearance, a Kiwi can outrun a human!
 
Kiwis typically mate for life, unless a more attractive male wanders along.  Their lifespan is unknown; however, it is guessed to be about 40 years in the wild.  The male will dig a burrow where the female will lay (usually) one egg.  The Kiwi lays the largest egg in proportion to its size of any bird in the world.  One egg can reach up to 20 percent of its mother's weight, which would be like a 150 pound woman giving birth to a 30 pound baby!  The female Kiwi must eat three times her normal amount of food during the 30 days the egg is growing.  However, two to three days before the egg is laid, there is no more room for any food in her stomach, so she is forced to fast.
  Relative size of a Kiwi egg to the female.         

The male will be the sole incubator of the egg.  Kiwi chicks hatch fully feathered with their eyes open and begin foraging for small worms and berries after their first week of life.  It may stay with Dad for up to 20 days before going on its own.

What does the future hold for the Kiwi?  Like many of New Zealand’s flightless birds, the Kiwi has suffered from habitat loss and the introduction of new predators, like cats and dogs.  A Kiwi recovery program called BNZ Save the Kiwi Trust was launched in 2002 in New Zealand.  Also, Operation Nest Egg  collects Kiwi eggs from the wild and raises the chicks until they are large enough to defend themselves against predators.  People living near Kiwi areas have learned to keep their pets leashed or indoors and to slow down their cars at Kiwi caution signs. 

Loose pets in the United States are also a detriment to wild bird populations, so please restrain them!

If you want to help endangered birds, part of the World Bird Sanctuary’s mission is to secure the future of threatened bird species in their natural environments.  You can help us fulfill our mission by simply visiting us and spreading what you’ve learned, becoming a member or friend, or adopting-a-bird, which helps us feed that bird for a year!

Submitted by Sara Oliver, World Bird Sanctuary Naturalist




Monday, October 29, 2012

Of Birds and Kilts


When I began volunteering at the World Bird Sanctuary in the spring of 2011, I had vague dreams of handling and flying birds. 

I worked hard to discover what my strengths (talking to visitors and bird room cleanup – that’s a nice way of saying I clean bird up poop – can I say poop in a blog post?) and weaknesses (bird food prep) as a Naturalist are. 

By fall 2011 I was helping with Owl Prowls.  By January 2012 I was ready to help with remote display events and even held walk-on roles in a few programs.  Having also learned to fly birds glove-to-glove, I had the luxury of volunteering to help out with a variety of on- and off-site events. 
The games were new and strange - here they are doing the caber tossing event (photo by Sandra Murray) 
Each fall, the St. Louis Scottish Games Organization (a not-for-profit) coordinates the Scottish Games event that takes place in Forest Park.  The purpose is for education, cultural exchange, philanthropy, and making clan connections.  They are open to anyone with interest in the history and rich culture of Scotland and Scottish heritage. 
 Executive Director Walter Crawford is quite the picture in his Kilt. (Photo by Sandra Murray)
I have been told by family members that there is Scottish blood (I think up through my paternal grandfather’s family) but I don’t think any research has ever been done.  Note to self: do research on Grandpa’s family line.   I did, however, marry into the Clan Murray.  My husband’s family has been able to trace their roots back to Scotland.  As a result of this history, I have also developed a crush on all things Scottish including several Scottish celebrities like Gerard Butler, David Tennant (Doctor Who – don’t get me started), and Craig Ferguson.  And, I have to admit, that I am crazy for men brave enough to wear Kilts!  I think it has something to do with getting to see their knees (sigh) and perhaps the constant mystery of what they wear (or don’t wear) beneath them!  So I was very excited to see the 2012 Scottish Games listed in the Help Needed email from World Bird Sanctuary that circulated in early September.  I eagerly submitted my name to participate.
 Volunteer Fred Abrolat releases Lewis (Photo by Sandra Murray)
I know you’re thinking, “Isn’t this supposed to be a blog about birds?”  Stick with me-- here come the birds.  A crew of humans from the World Bird Sanctuary (Walter Crawford, Roger Wallace, Fred Abrolat, Cathy Spahn, and Gina Staehle) and a crew of birds were with me at the Scottish Games.  We had Lewis & Clark – Bald Eagles; Tigger – Tawny Owl; Xena – Eurasian Eagle Owl; Sequoia – Red Tailed Hawk; and Lightning – Peregrine Falcon.   Most of us were either in Renaissance Faire style clothes or decked out in Kilts. 
  Little did I know there was something amiss with my skirt (photo by Cathy Spahn)
The first thing that happened to me that day was noticing that I was wearing my borrowed Ren Faire skirt inside out.  It stayed inside out all day.  The second thing that happened to me was a funny encounter with, uh, Clark’s poop.  There I go saying poop in a blog again.  As Clark was being transferred from his traveling crate to his display perch, and in an act of precise timing and aim, Clark sliced all over my lunch bag, water bottle, and camera.  The lens of my lovely Canon Rebel was covered in poop.  I think Roger was more upset about it than I was...like it was his fault Clark was aimed in just the right direction at the exact right moment.  For the most part it was nothing the water hose couldn’t fix.  My lunch was fine, the water bottle was fine, and my camera, after careful cleaning, went on to shoot more than 100 pictures.  I praised Clark for his spot on accuracy, then forgave him and made him pose for a picture with me to get even.
 Lewis was spot on with his flights (Photo by Sandra Murray)
Lewis gave two spectacular flight demonstrations in the main ring to the delight of the crowd.  For many that have seen this wonderful bird fly at Busch Stadium, it was a real treat to see his flight close up.  There were cameras and phones aimed all around as he flew back and forth between Roger and Fred. 
Crowds surrounded trainer Roger Wallace and Lewis after each flight (Photo by Sandra Murray) 
It was a pleasure to see peoples’ delight as they surrounded Roger after each demo to photograph Lewis and ask questions.  This is why I do this; seeing their faces light up as they encounter birds from World Bird Sanctuary.  I know that my face reflects the same joy and wonder as I look at them too.  There were lots of visitors to our area to ask questions about the birds and the facility.  We, of course, were happy to educate and invite them to visit.
 The food booth gave attendees the opportunity to try new foods (Photo by Sandra Murray)
The entire day was a feast for the eyes, ears, and taste buds as we listened to and watched the athletic games, bagpipes and pipe and drum corps competitions, and sampled the variety of distinctly Scottish foods (Haggis anyone?) available.

With a little sun on our noses and necks, we packed everyone back up and headed back to World Bird Sanctuary.  Next up for me is a trip to Kansas City for WBS’s participation in the Renaissance Faire.  Note to self: make sure your clothes are on right side out next time. 

The dreams that dance in my head now revolve around flying a Bald Eagle glove-to-glove and accompanying the flight team to a St. Louis Cardinals game.  And, Ok, I’ll admit it, I’d also like to get my husband into a kilt!

Submitted by Sandra Murray, World Bird Sanctuary Volunteer Naturalist

Photo by Lisbeth Hodges

Saturday, October 27, 2012

Sanibel The Sensational Bird


Today I want to introduce you to Sanibel.  She is a beautiful Bald Eagle.  She also just happens to be the national symbol for the United States of America.  Once you meet her you will definitely fall in love with her just like I did!
Sanibel - a big favorite with everyone
Sanibel was hatched in the wild on Sanibel Island, Florida.   As a juvenile, she was struck by a vehicle and sustained permanent damage to her right wing, which had to be partially amputated.  She was then transferred from a rescue center in Florida to the World Bird Sanctuary several years ago. 

Sanibel’s “personality” seems to rub off on those that handle and care for her.   As compared to other Bald Eagles I have handled, she has a very mellow personality.  If she has any quirks, she does seem to favor female more than male handlers.   Her favorite foods are fish, chicken, and her all-time favorite—rabbit!

There are northern and southern sub-species of the Bald Eagle.  Northern sub-species are larger than the Southern.  Sanibel is a Southern, since she is originally from Florida. 

The Bald Eagle is native only to North America.  Bald Eagles got their name from the white color on their head.  The term “balde” means white in Old English.  They are not actually bald.   Both males and females look the same when considering their plumage (feather color). 
Norbert at 3 years old - note the beginnings of white head and tail feathers
The differences between juvenile (young) and adult Bald Eagles are, however, very different.   For their first year of life, juveniles have all dark brown feathers with dark brown eyes and brown/black beaks.  Second and third year birds develop white feathers on their breasts, and those same feathers on fourth year birds then start to change back to dark brown again.  It will generally take about five years for the juvenile to change into adult plumage.  Over those years the head and tail feathers will change from brown to white.  Their eye and beak color will change to yellow.
Clark - entering his fifth year - note the white on head and tail
The Bald Eagle’s lifespan ranges from 20 to 25 years in the wild and 40 to 50 years in captivity (Sanibel is 22 years old this year).  Their wingspan ranges from six to eight feet, with the females having a larger wingspan.  In most birds of prey the females are larger than the males.  However, a northern male may be the same size or a bit larger than a southern female.  This is because northern species are larger than southern species.  Their diet ranges from small mammals, small birds, carrion (dead animals), to fish--which is generally their diet mainstay.  Bald Eagles are in the Fish Eagle genus after all!

Bald eagles build the largest nest of all birds of prey!  It is astounding to see one!  They mate for life, and each year they will return to the same nest (if it hasn’t been destroyed by weather or other causes) and add to it, so each year it can grow and grow!   The largest nest ever recorded was found in Florida.  It was over 10 feet wide, over 20 feet deep and weighed almost 3 tons!  Bald Eagles will generally lay from one to three eggs in a clutch (group of eggs).

In the early 1930’s the Bald Eagle population had decreased dramatically, due to the mistaken perception that eagles were predators of livestock.  Many Bald Eagles were shot by ranchers and farmers who thought they were protecting their flocks.  Also, many succumbed to poisoned carcasses put out as bait for wolves and coyotes; some were shot by people who thought it was great sport to take a shot at anything that flies.  So severe was the drop in population that people began to notice, and the Bald Eagle Act was passed in the 1940’s.  This act basically states that they are protected and no harm or disturbance could be targeted toward them.  It is now illegal for people to possess even a feather from a Bald Eagle, with the exception of some Native American tribes, where the Bald Eagle is part of their religious ceremonies.

After enactment of the Bald Eagle Act the populations began to recover, but around the same time DDT (dichloro- diphenyl- trichloroethane) had been developed for pesticide use in agriculture.  Unfortunately DDT had adverse effects on many animals, but most dramatically--birds.  It affects the calcium formation in eggshells. When birds, even Bald Eagles, would sit on their eggs, their weight would crush them because the shells were so thin.  Fortunately in the late sixties and early seventies several states put the Bald Eagle on the Endangered Species List to protect it further.  In 1972, DDT was banned in the U.S. After a thirty-five year recovery period, and due in good measure to the efforts of many conservation and rehabilitation organizations such as the World Bird Sanctuary, the Bald Eagle was finally taken off the Endangered Species List in 2007. 

The Bald Eagle, our cherished national symbol, is still protected to this day by the Bald Eagle Act. 
Like all the birds at WBS, Sanibel enjoys soaking in her water tub
Above and below you can find some pictures of Sanibel bathing.  It is such an awesome sight to see her bathe!   She really makes a big splash, even in the hearts of those who work with her on a daily basis. 
....and then, of course, there's a big splashy bath
Sanibel is available for adoption in our Adopt a Bird program.   To find out more information about our Adopt A Bird program call 636-861-3225 or visit our website.  All adoption donations are tax deductible. 

This summer Sanibel has been performing at Grant’s Farm (on display and in the bird show) in Grantwood Village near St. Louis, Missouri.  Sanibel is a very beautiful bird.  You should stop on by and visit her! 

Submitted by Lisbeth Hodges, World Bird Sanctuary Naturalist

Thursday, October 25, 2012

HEARING: It's Not What You Think It Is – Part 2


Howdy folks. It’s that time again and this time we are on to part 2 of amazing animal hearing.

In my last blog we discussed how the dolphin uses the bone of its jaw to pick up high frequencies and how the elephant can communicate up to thirty miles away with just its feet. So what’s next?
 Big-eared Bat - bats use sonar to "hear"

Well, I suppose we can’t talk about hearing without mentioning the bat.  Of course most people know that bats use ultrasonic echolocation to find their way (and their prey) in the dark.  As the bat is soaring through the air with the greatest of ease, it’s making very high-pitched noises that shoot out into the world, bounce off stuff and come back to the bat, basically telling the bat what’s out there.

What bats use is basically the same as what we humans use in submarines.  You know; like in the movies when the guy (or gal) is in the sub and you hear that BING… BING… BING… in the background.  That …BING… is the sonar, with the BING bouncing off what is around the sub and being “heard” with devices within the sub.  A bat’s sonar is super sensitive and helps them build a three dimensional map of the world.

The bat’s echolocation is so sensitive it can tell the bat the texture of the stuff around it and even how fast the bat is moving.  Some bats have the added ability to change the shape of their ears to help them pick up different types of sounds depending on the situation--if it is looking for its next meal, or just a place to hang for the night.

So, even though the range of a bat’s hearing (how far away they can hear noises) is fairly average, they rank high on my list for the sheer amount of information they get just from their ears.

While we are on the subject of nocturnal creatures, we might as well take some time to talk about the animal that started us down this path in the first place, the Barn Owl.
A Barn Owl's ears are not where you think they are.

Tyto alba…aka The Common Barn Owl…is quite possibly the most beautiful animal on Earth (in my humble opinion anyway).  Barn Owls are one very well distributed species.  Like bats, Barn Owls can be found all over the world, with the exception of Antarctica.  Also, like the bat, their hearing is remarkable.

If you have ever had the pleasure of seeing a Barn Owl in person, you know their most distinguished feature is their facial disk.  This is the ring of stiff feathers that gives their face that heart-shaped look.  Do any of you have satellite television?  Well this facial disk acts just like your satellite antenna, except that the Barn Owl’s “antenna” gathers sound.  All that noise is directed to their receivers, or ear openings.  Not only that, but their ears have flaps of skin covering them, and these flaps are not in a straight line on their heads.  On a Barn Owl the right ear flap is higher and further back on the head than the left ear.  This means that sound reaches each ear at a slightly different time.  The Barn Owl uses this difference in time to pinpoint exactly where the sound is located.  So when a mouse goes scurrying across a field way late at night, our Barn Owl friend can tell exactly where that mouse is without ever seeing it.

So our journey through naturally occurring sound receiving apparati continues.  Now we know, and knowledge is half the battle.  Our struggle for knowledge is not over yet.  Come back soon and we will continue our exploration of one of the most amazing senses--hearing.
WBS's Straw-colored Fruit Bats-- Batty & Scar

The next time you visit the World Bird Sanctuary take a stroll through our Nature Center where you’ll find our two Straw-colored Fruit Bats, Batty and Scar, just “hanging out” in their enclosure.

Be sure to check out our blog for the next installment on the wonderful sense of hearing….same bat time, same bat channel next month.

Submitted by Neal Cowan, World Bird Sanctuary Naturalist