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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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