Mammal: A group of ancestors distinguished from the reptiles and the birds by the possession of hair, three middle ear bones, mammary glands in females, and a brain. Also any vertebrate of the class Mammalia, having the body more or less covered in hair, nourishing the young with milk from the mammary glands, and, with the exception of the egg-laying monotremes, giving birth to live young.
Non-Mammal:
Non-Mammal: