10Northern Elephant Seal
While 500 children may seem like a big responsibility, it’s nothing to the male northern elephant seal. While the gigantic male seals (they are the second biggest seal in the world, just after the southern elephant seal) are notably unfriendly towards one another, the chief male seal will obtain control
over a harem of up to 100 female elephant seals, copulating with as many as he can. In return, he protects the females from potential dangers, which counts for something, we suppose.