Mammals:
Are Warm-blooded (i.e. with an internal heat source and regulation),
Are Viviparous - the Duck-billed Platypus and one or two other animals are warm-blooded but lay eggs, and strictly speaking belong to their own group, the monotremes, not mammals.
Lactate - to feed their own young directly.
Have hair, to greater or lesser extent depending on species and (in our species at least) sex.
The birds are warm-blooded but are all oviparous, do not lactate and have feathers not hair - and are closer to reptiles than to mammals.
Animals are cold blooded and mammals are warm blooded. Mammals have eggs and mammals give birth.
if your talking about what is the difference between mammals and non-mammals, the difference is: the non-mammals lay eggs and the mammals just have baby's out their vagina.. XD
mammals eat other species and other animals
hair
The other animals are Mammals is Dolphin,Cat,Dog,Cheetah,Lion,Tiger And Others Every Mammals is Dangerous And Some Mammals Extinc And Others Is No Longer Exist Like a Dinosaur And Dinosaur is Very Dangerous Too.
they are living
Many other animals, such as most mammals and birds.
Predators like lions, T-Rex, and other mammals
The presence of a backbone (a "vertebrae") does not DEFINE a mammal because other animals also have backbones, eg reptiles, birds and fish - these animals are also "vertebrates".Mammals are mammals because they are the only animals to have fur/hair and feed their young on milk.
Hair and mammillary glands.
Mammals can give birth,where few animals cant
(1) Only mammals nurse their babies on the mother's milk. (2) Only mammals have hair. (3) Mammals are warm-blooded. Birds are warm-blooded, too, but nearly all other animals are coldblooded. (4) Mammals have a larger, more well-developed brain than other animals. (5) Most mammals give their young offspring more protection and training than other animals.
Mammals are different than other animals for a few reasons, but the main one is the presence of hair or fur. Another reason is that mammals have mammary glands.