What amphibious Australian mammal lays eggs?

The platypus fits this description. It is an egg-laying mammal, and while it lives on dry land, it is semi-aquatic, hunting for its food in water The platypus is not the only egg-laying mammal. There are three known species of egg-laying mammals, or monotremes.

They are the platypus and short-beaked echidna ( Tachyglossus aculeatus ) of Australia, and the long-beaked echidna ( Zaglosssus bruijni ) of New Guinea.

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