But we found some unusual animal dads. A father sea catfish keeps his eggs in his mouth until they are ready to hatch. He will not eat until his young are born, which may take several weeks. Father cockroach eats bird droppings to obtain precious nitrogen, which he carries back to feed his young. Father Darwin frog hatches his eggs in a pouch in his mouth.
Marmosets are tiny South American monkeys.
The fathers take care of their babies from birth. When the marmoset is born, the father cleans it, then carries it to the mother only when it needs to be nursed. When the baby can eat solid food, the father will feed it. Father Emperor penguin withstands the Antarctic cold for 60 days or more to protect his eggs, which he keeps on his feet, covered with a feathered flap. During this entire time he doesn't eat a thing.