Blanket octopus pairs are some of the undersea world ... a modified arm that holds its sperm—and gives it to the female, who keeps it in the mantle cavity until needed for fertilization.

According to The Great Barrier Reef Foundation, a male blanket octopus weighs 40,000 times less than a female. It’s the largest size discrepancy that we currently know of in any animal on the ...

The blanket octopus possesses the largest sex size discrepancy ... The mating ritual of this group is just as strange as its preying habits. The female rips off the male’s arm, and stores ...