3. Bird Feathers
What makes a bird a bird? Feathers. Birds are the only animals that have feathers and they come in many sizes, colors, and shapes. They also serve many purposes, too. Here you will learn about the parts of a feather, why birds have different feathers, and some interesting facts. After you have read through the different sections on feathers, try the on-line quiz to see how much you have learned.
Types of Feathers
Feathers come in many different shapes, but all of them can be classified into six different types of feathers. The feathers we are used to seeing are flight and contour. Down feathers are what we use in pillows, quilts, and jackets. The other three feathers, semiplume, filoplume, and bristle, are not as common, but still useful to birds.
Flight feathers are found two places on birds: the wings and tail. Flight feathers are long, and on the wings, have one side of the vane wider than the other. They also have stronger barbules which give them more strength for flight.
Contour feathers give shape and color to the bird. They are found everywhere except the beak, legs, and feet. Contour feathers are colored only at the ends (the only part that we see). At its base, a contour feather becomes downy which helps insulate the bird.
Down feathers have little or no shaft. They are soft and fluffy. Down feathers help insulate birds by trapping air. Some birds, such as herons, have special down feathers called powder down which breaks up into a fine powder. The bird then spreads this fine powder all over its body to act as a water repellent.
Semiplume feathers are a cross between down and contour feathers. Unlike down, they do have a well formed shaft. However, they do not have well developed barbicels which make them soft. Semiplume feathers are found underneath contour feathers and are used for insulation.
Bristle feathers are very stiff with only a few barbs found at the base. Bristle feathers are found around the mouth of insect eating birds where they act as a funnel. They can also be found around the eyes where they work like eyelashes.
Filoplume feathers are incredibly small. They have a tuft of barbs at the end of the shaft. Unlike other feathers which are attached to muscle for movement, filoplume feathers are attached to nerve endings. These feathers send messages to the brain that give information about the placement of feathers for flight, insulation, and preening.
Parts Of A Feather
Colors In Feathers
Feathers come in every color of the rainbow. Most colors are caused by a pigment, just like food coloring being added to frosting. If you add drops of red food coloring (the pigment) the frosting turns a reddish color. The same works for the color yellow. But there is a problem with the last primary color, blue. In feathers, there is no blue pigment. So how can a Blue Jay appear blue if it has no blue pigments?
The answer is found in the structure of the feather, or the way the feather is designed. When light hits the blue feather (remember that white light has all of the colors of the rainbow) the feather is designed to reflect back only the blue light to our eyes. This can be shown in a simple experiment. If you take a blue feather and shine a flashlight on it from the top, you will see the bright blue. However, if you shine the light from underneath the feather, the blue color disappears. If you repeat this experiment with a red feather, the feather will appear red no matter which direction the light passes through the feather. Look at the photos taken below of a Blue Jay feather and a Red-lored Amazon Parrot.
So how are green feathers made? Touracos are the only bird that can produce green pigments. All other green birds use a combination of pigments and reflecting blue wave lengths. Can you figure out what color pigment is needed to make green when mixed with the blue wave lengths? If you guessed yellow, you are correct. The wing at the top of this page has yellow pigments, but also reflects blue light. This makes our eye see the color green.
Uses Of Feathers
There are so many different ways that birds use feathers that there is no way they can all be listed here. This page will let you know the most common uses and a few that are odd but interesting.
Obviously, birds use feathers to fly. The long flight feathers help propel the bird through the air, while the contour feathers make the rest of the bird streamline.
During the colder months, feathers help insulate birds to keep them warm. Also, during the hot months feathers can help keep the bird cool. Some birds that live in colder areas, such as Redpolls, have up to 30% more feathers during the winter than summer.
Owls have special serrated flight feathers on their wings that help them fly silently. The serrated edge breaks up the air as it moves over the wing reducing the amount of noise. Ducks and doves, on the other had, have a very smooth leading edge to their wing, and therefore produce a loud whistling noise when flying.
Some birds can move their brightly colored feathers in a way that attracts a mate. Peacocks can fan their upper tail covert feathers producing a beautiful bluish green fan. Other birds, such as the Eastern Kingbird, have a stripe of colorful feathers hidden underneath the contour feathers on top of their head. The Eastern Kingbird displays these bright yellow feathers only when trying to find a mate.
Some birds produce sounds using their feathers. The Ruffed Grouse flaps its wings while standing on a hollow log to produce a drumming sound (and the hollow log makes the sound louder as it echoes inside). Nighthawks and Snipe dive towards the ground and pull up at the last second to produce an unusual ‘growl-like’ sound. This sound is made as air travels quickly over the wing feathers.
Some birds, like the Dark-eyed Junco, have bright feathers on the outside of their tail which they flash when being chased. They then cover these feathers and quickly turn the other way while trying to lose their predator.
Believe it or not, Ptarmigans (birds that live in the snow) have feathers on their feet that act like snowshoes. These feathers help the birds from falling through deep snow.
Some birds don’t want to be seen, so their feathers help them blend in with their habitat. Owls, for example, can easily blend in with bark as they push their bodies up against a tree’s trunk. The Snowy Owl, which lives where there are no trees, blends in perfectly with a wintry scene.
Feathers help protect the bird’s delicate skin. Without feathers, a bird would be cut badly if it flew into a thick bush. Some birds, such as Hornbills, even have bristle feathers that act like eyelashes which protect the bird’s eyes
The Sandgrouse, a bird that lives in the desert, dips its breast feathers into water and then flies to its chicks where they will suck the water off the parent’s feathers.
Feathers and the Law
In the early 20th century, birds were being hunted for their feathers. These feathers were used to decorate women’s hats. Some species with beautiful plumes, such as the Snowy Egret, had very low populations.
Fortunately, the Migratory Bird Treaty Act of 1918 helped save many species of birds. The Migratory Bird Treaty Act is a commitment by four countries to protect birds that are regularly found in each country. These countries are: United States, Russia, Japan, and Mexico. This act made it illegal to collect or posses any bird, feather, egg, or nest.
Birds that are found in the United States that are not protected by any laws include the House Sparrow, Rock Pigeon, and European Starling. These three species are not native to our country. They were brought here from Europe.
So if you find a beautiful feather laying on the ground what should you do? The best thing is to pick it up, study and enjoy it, and then put it back where you found it. The same thing goes for any abandoned eggs or nests you find. In order to keep any part of a bird, you need to have two special salvage permits. One from the state where you are collecting birds, and the other from the federal government.
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