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==Introduction==

==Introduction==

Feathers are one of the epidermal growths that form the distinctive outer covering, or '''plumage''' of birds.  They are the outstanding characteristic that distinguishes the Class '''Aves''' from all other living groups.  Feathers ar grouped into feather ''tracts''.

Feathers are one of the epidermal growths that form the distinctive outer covering, or '''plumage''' of birds.  They are the outstanding characteristic that distinguishes the Class '''Aves''' from all other living groups.  Feathers are grouped into feather ''tracts''.

==Structure & Function==

==Structure & Function==