That bizarre creature - the platypus

[mellowyellow]

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Faculty of Science - University of Copenhagen
Australia's beaver-like, duck-billed platypus exhibits an array of bizarre characteristics: it lays eggs instead of giving birth to live babies, sweats milk, has venomous spurs and is even equipped with 10 sex chromosomes. Now, researchers have conducted a unique mapping of the platypus genome and found answers regarding the origins of a few of its stranger features……
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https://www.sciencedaily.com/releases/2021/01/210106133034.htm​

Summary
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[Aunt Marg]

Platypuses are among the few venomous mammals.

Males have a spur on the back of their hind feet that is connected to a venom-secreting gland.