Parameter Tree:
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > REPTILES

Definition:
Reptiles are cold-blooded tetrapod craniates which breathe using lungs, have
a dry, scaly skin and lay large, shelled eggs. They live in all types
of terrestrial habitats, the majority in tropical regions; many
secondarily freshwater and marine species. 


Reference:
Burn, David M. Animal World. 1980. Octopus Books Ltd. London.