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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 ...

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.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  ...

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 ) ...

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 ...

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.

udel.edu/~gshriver/pdf/feathers.pdf

Feathers are fundamental to many aspects of bird existence. – Insulation ... The central shaft of a BARB is call the RAMUS ... amount of bones. • Feathers ... There are eight major feather tracts or PTERYLAE. – Capital ... Feathers developed from an initial hollow .... Once an individual gets to its' First Alternate molt the pattern.

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.ncbi.nlm.nih.gov/pmc/articles/PMC2880151

Mar 17, 2010 ... In 1638, Galileo described bird bones as hollow and lightweight, and modern ... passages, and have feathers and enlarged lift-generating surfaces. ... factor in mediating its strength and stiffness (e.g. Currey 2002), and there is ample ... For example, the round and thin-walled humeral shafts of birds are an ...

www.peteducation.com/article.cfm?aid=2776

As there are different types of hair on furred animals, birds have different kinds of feathers, each having a particular function. ... Feathers have a central shaft.