Attack of the pregnant cannibal fathers

For the pipefish (and their relatives, seahorses and sea dragons), it's the males who get pregnant. After a male fertilises the female's eggs, he takes them up into a special brood pouch and shelters them until the babies hatch from his pot-bellied stomach several weeks later. He may seem like a shoe-in for the Dad-of-the-year award but this fatherly commitment has a sinister side to it. Not all of the babies he cares for make it out of his stomach alive.