Most have four legs
Some have flippers
Parents find food for their babies
Mammals breathe with lungs
Covered in feathers
Birds breathe with lungs
Have to feets, two wings and beak
All viviparous, apart from monotremes
Birds can be carnivores, herbivores or omnivores
Oviparous
Mammals can be carnivores, herbivores or omnivores
Covered in hair or fur
Babies drink their mother's milk
