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Does the penguin male incubating an egg count?
It’s seahorses, leafy sea dragons, and pipefish; members of the Syngnathidae family: http://en.wikipedia.org/wiki/Syngnathidae
@DominicX OK, right…but any other species besides?
I’m pretty sure Syngnathidae is the only group of animals that does this. I don’t think there are any other animals that have “male pregnancies”.
In some species of frogs, I believe the males carry the eggs until they hatch.
Midwife toads and some other amphibians, and quite a few species of mouthbrooding fish. Among birds, phalaropes. After gestation, marmosets and tamarins turn all baby care except nursing over to the males.