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en.wikipedia.org/wiki/Feather

Feathers are epidermal growths that form the distinctive outer covering, or plumage, on birds. ... A typical vaned feather features a main shaft, called the rachis. ... two or three times more than its skeleton, since many bones are hollow and contain air sacs. Color patterns serve as camouflage against predators for birds in their ...

www.answers.com/Q/Why_are_a_birds_bones_and_their_central_shaft_of_its_feathers_hollow

In order for the bird to be as light as possible for flight. This hollowness reduces their body weight by about 5%, depending on what kind of bird it is, in contrast to  ...

academy.allaboutbirds.org/feathers-article

All About Feathers Unique to birds and their dinosaur ancestors, feathers have ... For example, the interlocking Velcro-like structure on many bird feathers .... I saw a bird in Mexico with three tiny teardrop feathers on its tailtip. mediums ize fairly ...

www.birdsinbackyards.net/birds/Bird-Anatomy-How-do-birds-fly

The structure of their bones resembles honeycomb, making them very strong but also very ... A feather consists of a central hollow shaft, rather like a tree trunk.

www.earthlife.net/birds/feathers.html

Scientists believe that flight evolved in birds as a result of their possessing basic ... Feathers have a basic form of a central hollow supporting shaft called a 'rachis' and ... These give the bird its shape and colour and include both the flight feathers, called .... The Anatomy Menu (Today's Special Offer = Bones, blood and guts ) ...

projectbeak.org/adaptations/feathers_parts.htm

But when you examine that design closely, you see it's really very complex. ... The shaft is the main central support that runs the length of the feather. ... The quill is the smooth, hollow, non-colored part of the feather, which inserts into a ... and taking care of your hair, birds spend great amounts of time caring for their feathers.

petcaretips.net/bird-feather.html

The most noticeable feature of a bird is its feathers. ... and function. There is a central rachis, or shaft, which is hollow. Inside, dried remains of the pulp form ...

www.fernbank.edu/Birding/feathers.htm

Feathers have a basic form of a hollow, central shaft called a rachis and a number of ... linked together by a set of barbules and their "hooklets" sometimes called 'Hamuli' ... Contour feathers give the bird its characteristic smooth round shape.

www.scienceclarified.com/Bi-Ca/Birds.html

Birds are warm-blooded vertebrate (having a backbone) animals whose bodies are covered with ... From impressions left in stone, it had four legs and what appeared to be feathers on its body. ... The bones of the flying birds are structured for flight. ... Quill: The hollow central shaft of a feather from which the barbs grow.