<P> Feathers are a feature characteristic of birds ( though also present in some dinosaurs not currently considered to be true birds ) . They facilitate flight , provide insulation that aids in thermoregulation , and are used in display , camouflage , and signalling . There are several types of feathers , each serving its own set of purposes . Feathers are epidermal growths attached to the skin and arise only in specific tracts of skin called pterylae . The distribution pattern of these feather tracts ( pterylosis ) is used in taxonomy and systematics . The arrangement and appearance of feathers on the body , called plumage , may vary within species by age , social status , and sex . </P>
<P> Feathers are a feature characteristic of birds ( though also present in some dinosaurs not currently considered to be true birds ) . They facilitate flight , provide insulation that aids in thermoregulation , and are used in display , camouflage , and signalling . There are several types of feathers , each serving its own set of purposes . Feathers are epidermal growths attached to the skin and arise only in specific tracts of skin called pterylae . The distribution pattern of these feather tracts ( pterylosis ) is used in taxonomy and systematics . The arrangement and appearance of feathers on the body , called plumage , may vary within species by age , social status , and sex . </P>
what does a bird have that no other animal has
what does a bird have that no other animal has
Feathers
Feathers