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Barnacles Go To Unbelievable Lengths to Hook Up

Acorn barnacles might look like jagged little rocks at low tide, but they have a surprisingly wild sex life. These crusty little animals — related to crabs and shrimp — have the longest penis of any animal relative to their body size. It’s up to eight times the length of the barnacle itself!
Season 9 Episode 6 Length 03:58 Premiere: 04/26/22

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