mammals vs birds facts IIOnline version ¿Qué características tienen los mamíferos y peces? búscalas y relaciónalas. by tu profesor de TIC 1 mammals 2 Birds All viviparous, apart from monotremes Babies drink their mother's milk Most have four legs Some have flippers Covered in hair or fur Mammals breathe with lungs Mammals can be carnivores, herbivores or omnivores Oviparous Parents find food for their babies Have to feets, two wings and beak Covered in feathers Birds breathe with lungs Birds can be carnivores, herbivores or omnivores