Matching Pairs Vertebrates FeaturesOnline version Vertebrates basic features by Rubén Herradon Parra 1 Most mammals are viviparous. 2 Most mammals have fur covering their bodies. 3 Most mammals have four legs, some of them have flippers and wings. 4 Baby mammals drink their mother´s milk. 5 Monotremens are special mammas because they are oviparous, it means they lay eggs. 6 Mammals can be carnivores, herbivores and omnivores. 7 Mammals breathe with teir lungs.