Mammals | Mammalia Drawings & Dimensions

Mammals (Mammalia) are a diverse class of warm-blooded vertebrates characterized by the presence of mammary glands, which females use to nurse their young. They also typically have hair or fur, a neocortex (a region of the brain), and three middle ear bones.哺乳动物（Mammalia）是一类热血脊椎动物，以其乳腺的存在为特征，乳腺为雌性哺乳动物提供哺乳幼崽之用。它们通常还具有毛发或皮毛、新皮层（大脑的一个区域）以及三个中耳骨。