The Female Hyenas Pseudopenis!

Female Hyenas have evolved the crazy structure of a pseudopenis. It not only looks exactly like a male penis it can also become erect. It is actually evolved from an extended clitoris which is made of the same embryonic tissue as the penis.  The pseudopenis stumped scientists as it is such a costly adaptation, 10% of female hyenas die in childbirth as they have to push the pups down the narrow tube of the pseudopenis! It turns out that penis presentation is important in submissive displays between subordinate females and dominant females.