• Emperor penguins - if you've seen March of the Penguins, you know what I mean.
• Marsupial frogs - dad watches the eggs hatch and then helps the tadpoles wriggle along his back until they enter pouches on his hips where they live for a few weeks and grow into frogs.
• Seahorses - mom deposits eggs into a pouch on dad's abdomen, where they are fertilized. Dad then carries the embryos to term, nourishing and then birthing them from the pouch.
• Hardhead catfish - dad carries the eggs in his mouth for 60 days until they hatch.
• Marmosets - dad is the primary parent who carries, feeds and grooms the infants after their first few weeks of life, and may assist mom during birth by grooming and licking the newborns.

Just some fun food for thought.