1) They breathe with LUNGS. 2) They feed their young with MILK. 3) They have FUR or HAIR. 4) Most give birth to LIVE babies (viviparous). 5) They are WARM-BLOODED. 6) Some mammals live in the SEA. 7) Many mammals live on LAND. 8) The Platypus and Echidna LAY EGGS, but feed their young with MILK.

LEARN MAMMALS CHARACTERISTICS

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