Vocabulary. Live on land, at sea, in the air and underground Are warm blooded Have either fur or hair Give Birth to live young (rather than laying eggs ) Eat many kinds of foods---plants, meat, fish, insects
warm blooded: to maintain a warm body temperature
cold-blooded: their body temperature depends on their environment
gills: a respiratory organ of most aquatic animals
bill: allows birds to catch fish, crack seeds, etc.
vertebrates: have a backbone