The platypus
The platypus is a unique, semi-aquatic mammal found only in Australia. It's known for its duck-like bill, beaver-like tail, and otter-like feet. The platypus is one of the few venomous mammals, with males possessing a spur on their hind feet that delivers venom. Furthermore, the platypus is one of the only two mammals that lay eggs, along with the echidna.
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