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