ANIMAL KINGDOM-BIRDS

BIRDS MAKE UP THE CLASS   AVES.There   are more than 9,000   species ,   almost   all   of which can fly.(the only   flightless birds   are Penguins , ostriches, rheas,cassowaries, and kiwis ).The ability to fly is   reflected   in the typical   bird features ; forelimbs modified as wings , a streamlined   body ; and hallow bones to reduce weight.
ALL birds lay hard-shell eggs , which the parents incubate.Birds beak and feet vary according to diet and way of    life .Beak range from    general purpose types suitable for a mixed diet .Feet range    from   the webbed "paddles" of ducks   to the   talons of bird of prey.
Plumage also varies widely , and in many species the male is brightly coloured    for courtship display where as the female is drab.

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