Reptiles , They can not control body temperature, They must lay their eggs on land, They do not usually live in very cold parts, They do not produce milk and lay eggs., Mammals , They can control the temperature of their body, They produce milk for their babies, They are the only flying vertebrates (like bats) that do not lay eggs, They usually have hair or fur., Whales and dolphins belong here. , Amphibians, They can live in fresh water AND on land, They must lay their eggs in water., Unlike reptiles, they can't live all the time on land., Fish, They are the only vertebrates that don't breathe air., Dolphins and whales do not belong here. , They live only in the sea, lakes, or rivers., Birds, They have feathers to keep them warm., They are warm-blooded and lay eggs, Penguins belong here..

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