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. Most father penguins lose about 25 pounds while they wait for their babies to hatch. Afterward, they feed the chicks a special liquid from their throats. When the mother penguins return to care for the young, the fathers go to sea to eat and rest.
Rheas are large South American birds similar to ostriches.
Father rhea takes sole care of his young. From eggs to chicks, he feeds, defends, and protects them until they are old enough to survive on their own. The father then looks after the eggs for about 2 months, until they hatch and leave the pouch. He continues to protect the young until they are able to live on their own. He guards the nest and protects the baby fish when they hatch.