Assertion: octopus's hectocotylus | /r/CapableOf | grow up to 2 centimeters
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text: The hectocotylus of the male argonaut (aka paper nautilus) can grow up to 2 centimeters (0.8 in) long, which doesn’t sound like much until you take into account the fact that the octopus itself only reaches about 1 centimeter (0.4 in) long, so his penis is twice as long as his entire body.