how are mammals born
Most mammals are born alive. There are two egg-laying mammals. The platypus and the echidna are both egg-laying mammals, or monotremes. They are still classified as mammals be â¦ cause they feed their young on mothers' milk-a characteristic unique to mammals alone.There are just three known species of egg-laying mammals, or monotremes.here are two egg-laying mammals. The platypus and the echidna are both egg-laying mammals, or monotremes. They are still classified as mammals be â¦ cause they feed their young on mothers' milk-a characteristic unique to mammals alone. There are just three known species of egg-laying mammals, or monotremes.