Male seahorses give birth.


Kelly McCarthy, Flickr

Unlike any other species, the males become pregnant. Females insert her eggs through an oviduct into the male's brood pouch. The male wiggles to get the eggs into position. Once all the eggs are inserted, the male goes to a nearby coral or seaweed and grabs on with his tail to wait out gestation, which may last several weeks. When it's time to give birth, he'll contort his body in contractions, until the young are born, sometimes over a period of minutes or hours. Baby seahorses look just like miniature versions of their parents.