Mammals will have shorter limbs and thicker bodies in colder environments than mammals in warm environments, on average.
Mammals are a group of vertebrate animals constituting the class Mammalia, characterized by the presence of mammary glands which in women produce milk for feeding their young, a neocortex, fur or hair, and 3 middle ear bones.
Mammals are vertebrates with hair, mammary glands used to suckle young with milk, a diaphragm, three bones inside the middle ear, and a lower jaw made of a single pair of bones that articulates in a unique way with the cranium.
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