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Parameter Tree:
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > BIRDS
Definition:
Birds, of the class Aves, are warm-blooded craniates with a body covering
of feathers; typically with forelimbs modified as wings for active flight.
They are free living (most can fly) in all terrestrial and surface water
habitats; some are capable of swimming underwater. 
Reference:
Burns, David M. Animal World. 1980. Octopus Books Ltd. London.
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