Mammals
Hair
Mammary glands
Lower jaw made up of a single jaw
Three middle ear bone
Diaphragm
Birds
lays eggs
warm blooded
beaks
feathers
four chamber hearts
Amphibians
Cold Blooded
Can survive in water and on land
Typically reproduce in the sea
Reptiles
Reptiles are ectothermic vertebrates
Their skin has scales, but no hair or feathers.
They have three-chambered hearts (except for alligators and crocodiles, which have four-chambered hearts).
They have claws on their toes (except those which do not have legs, such as legless lizards).
They are the first animals, in evolution, to develop the amniotic egg. This allows reptiles to lay eggs on land.
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