Mammals are vertebrate animals., They have a skeleton inside their bodies., They are warm-blooded animals., Their body temperature is constant., Mammals have hair or fur to protect their bodies., Mammals can walk, run, jump, fly or swim., They breathe with lungs., Mammals are plant-eaters, meat-eaters or plant- and meat-eaters., Mammals are born alive and suckle milk from their mother's body.,

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