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Great Blue Herons Might Build a New Nest Its Food

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Great Blue Herons Might Build a New Nest Its Food Volume 28/Issue 6 Great Blue Heron February 2015 Great Blue Heron Inside: • Wading Birds • Fatal Fashion • A Heron Valentine John Harrison [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons Great Blue Heron f you have spent any time along one of Idaho’s begins. In late winter, the herons grow special Ilakes, rivers or streams, you have probably met long beautiful feathers called nuptial a great blue heron. This bird’s name can help (NUP-chew-al) plumes. They display these you identify it. It is called great because it is so plumes to make themselves look big and tall—about the size of a third grader. Blue comes impressive. This helps a heron claim a territory from this bird’s blue-gray feathers. Heron refers and attract a mate. to the group of birds to which the great blue heron belongs. Herons nest in groups called a heronry. They build their stick nests high up in large trees. Some other things you will notice about great Often a heronry is used by the birds for many blue herons are their long beaks, long necks and years. Some heronries can have hundreds of long legs. These features help this bird catch nests. Great blue herons might build a new nest its food. Fish and other aquatic animals are or fix up an old one. The male gathers sticks favorite foods. Having long legs makes it easier and the female builds the nest. Two to six pale to wade into deep water to find food. The long blue eggs are laid by mid-March. Both parents neck allows the heron to reach farther to catch incubate the eggs and feed their nestlings. food. It also allows the bird to strike at food Young herons grow fast! Two weeks after with lightning speed. The long beak is used for hatching, they can leave the nest and perch grasping slippery prey. on nearby branches. This is why they are often called branchers. Great blue herons spend most of the year by themselves. This changes in February when Many heronries can be the nesting season found on small islands. The surrounding water helps keep away predators that can climb, like raccoons. Any predator trying to climb into a nest tree is in for a nasty surprise. Parents and young herons will throw up and poop on intruders— yuck! But it works, and predators usually learn their lesson. You can find great blue herons in many parts of Idaho all year. The key to spending the winter is open water. If great blue herons can find open water in the winter, then they will probably stick around. If ice covers the water, then the herons will leave and head to southern Idaho until spring. Wading birds have a neat adaptation to help them stay clean and dry. Specialized feathers Wading Birds called powder down grow on the chest and sides of wading birds. These feathers grow constantly. The ends of these feathers fray into a powdery reat blue herons belong to a group of birds substance like baby powder. A wading bird will called wading birds. This includes herons, G rub this powder onto its feathers with a special egrets, bitterns, ibis and flamingoes. More than 65 fringed claw on its middle toes. Powder down different kinds of wading birds are found all over makes living in wet places a little easier. the world, except in Antarctica. Eighteen live in North America and seven of these live in Idaho. Another cool adaptation is a wading bird’s long Our largest wading bird is the great blue heron. neck. Often, the neck is held in the shape of an It is four feet tall. The smallest heron in the world “S.” When a wading bird flies, its neck is not is the little bittern. It is only a foot tall and lives in extended. Instead, the neck looks like it is coiled Africa and parts of southern Europe and Asia. up. This makes flying easier. A modification to one of the bird’s neck bones causes this “S” shape. If Wading birds can be found just about anywhere you feel the back of your neck, you can feel your they can find water. Lakes, streams, rivers, bones. They help you hold your head up and let marshes, and swamps are just a few places where you move your head around. These bones let wading birds live. They are all carnivores. Fish, wading birds do the same thing but they also amphibians, reptiles, crayfish, snails, worms, allow the birds to strike quickly to capture food. clams, small mammals like mice and voles and even small birds are eaten by wading birds. Most wading birds nest in colonies. In some Scientists have observed over 30 different feeding places, several different species will nest in the behaviors these birds use to catch food. Some same colony. Hundreds of nests of different of them wade to scare fish from shelter. Others species of heron can be found in some colonies, shade the water with their wings to see better and especially in the southern United States. Overall, attract prey. A few wading birds even use bait! wading birds are important indicators of the They place things like insects, twigs and flowers health of wetlands. A healthy population of on the surface of the water to attract their meal. wading birds means a healthy habitat. White-faced Ibis Crane or Heron? © Catherine Zinsky daho has two large, long-necked, Ilong-legged birds that are easy to confuse. These are the great blue heron and the sandhill crane. With a little bit of careful observation, you can learn to tell the difference. Checking out the habitat is a good place to start. Both species like wet habitats, but great blue herons prefer open water like a river or pond. Sandhill cranes like wet meadows, marshes and drier prairie-type habitats. Herons nest in colonies in large trees. Cranes nest on the ground and not in a colony. Both species are about the same height, but sandhill cranes weigh twice as much. This makes the 10-pound crane look bulkier. Great blue herons are very slender. While great blue herons are blue-gray, sandhill cranes are pale silvery gray. Great blue herons have black-and-white heads with a sharp yellow beak. The head of a sandhill crane is pale with a red crown and its beak is more blunt and dark-colored. You can see a big difference when you see these birds flying. Great blue herons fly with their neck coiled against their shoulders. Sandhill cranes fly with their long neck stretched out. Additionally, herons are usually alone while cranes frequently fly in pairs or flocks. The final thing to do is listen. Herons are usually quiet, but when they make a sound it is a loud croaking “FRAWWWNK.” Sandhill cranes are known for their bugling calls. It’s a sound that carries for many miles and is often given in flight. photo from USFWS library Next time you see one of Idaho’s long-necked, long-legged birds, check it out. With a little practice, you will be an expert at identifying the great blue heron and the sandhill crane. In 1896, two Boston ladies, Harriet Hemenway and Minna Hall, begin a boycott of hats with feathers. Their boycott spread across the United States and even to Europe. Women stopped buying and wearing hats decorated with feathers. States began to ban the killing of birds for their feathers. In 1900, Congress passed the Lacey Act. This prevented plume hunters from transporting feathers across states where killing wading birds was illegal. The boycott and new laws stopped the feather trade. Wading birds were saved from extinction. It is hard to believe that our Fatal beautiful wading birds were almost lost because of hats. Fashion Opera singer Emmy Destinn wearing a plume-covered hat, around 1909. he population of most wading Tbirds in the United States is healthy today. But over a hundred years ago, this was not the case. At that time, both scientists and bird watchers were afraid that many species of wading bird were going to become extinct. The reason for their concern was all because of fashion. In the late 1800s and early 1900s, bird plumes, other feathers and even entire dead birds were used as fashionable decorations on women’s hats. So-called plume hunters killed adult wading birds at their colonies to get their nuptial plumes. It took the nuptial plumes of six snowy egrets to equal one ounce of feathers. In one nine-month period, 129,168 snowy egrets were killed just for the London plume markets! When adult birds were killed, their nestlings were left to starve in their nests. Entire colonies were wiped out. It did not take long for populations of some wading birds to almost disappear. Fortunately, people began Early 20th century illustration of plume types. to understand what was happening to wading birds. Public outcry increased. t’s February and that means Valentine’s Day. IWhat are you giving your favorite valentine? How about a stick, pebble or a dead mouse? How about a little showing off with some fancy clothes or a special dance? You could try making loud humming, popping or hooting noises. No? This might not impress your valentine, but in the bird world, it’s just like sending cards and flowers. A Heron Courtship is serious business. It helps males establish a territory and attract a mate.
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