Mammal that lay eggs and have back bone?

Answer 1

Birds, most reptiles, many fish and almost all amphibians lay eggs and have a backbone. In addition, there are the monotremes, or egg-laying mammals, which include the platypus and the echidna.

Answer 2

All mammals have a backbone, but the only mammals which lay eggs are the group known as monotremes. This group includes just three species: platypus, short-beaked echidna and long-beaked echidna.

Answer 3

All mammals have a backbone. Therefore, the two mammals which lay eggs both have backbones.

The platypus and the echidna are the only two egg-laying mammals in existence.

Answer 4

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