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The one arm an octopus will never risk in a fight—its sex arm

For an octopus, exploring the ocean floor with eight highly sensitive arms is a constant game of roulette. These limbs are ...

The Octopus Penis Arm Doesn’t Just Deliver Sperm—It Sniffs Out the Sweet Spot

The hectocotylus is both a reproductive and sensory organ, Harvard scientists and others have found. Octopuses are some of ...