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並前往https://www.theguardian.com/australia-news/2021/jun/11/australian-researchers-discover-why-only-two-heads-of-echidna-penis-become-erect-at-one-time

Australian researchers discover why only two of echidna's four ...

The penis of an echidna has four heads but only two become erect at any one time. Now, Australian researchers have uncovered why.

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