There are only two types of Monotremes (egg-laying mammals): the platypus, and a few species of echidna. I've seen both in the wild, in Tasmania and Victoria, though some echidnas range through Papua New Guinea.
This is a nicely displayed platypus skeleton at the Smithsonian National Museum of Natural History. I hadn't previously noticed that their rear feet have heel spurs, and just read that they can deliver a venemous strike with this feature!
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