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The male penguins protect the female penguins and their babies.
So that the chick will live.
they have to feed their babies
Female mammals feed their babies milk from their bodies. http://www.encyclopedia.com/doc/1G1-186991287.html
In many penguin species, including the Emperor penguin, female penguins leave to feed while males incubate the eggs. This strategy allows females to replenish their energy stores after fasting during egg formation and incubation, while males can focus on protecting the eggs and keeping them warm. It is an energy-efficient way to ensure the survival and health of the offspring.
penguins can have babies
Penguins have feathers, wings and a beak. Penguins lay eggs and feed their babies.
Penguins only hatch one egg at a time. The Male rests the egg on it's feet and keeps it warm with a body fold, while the female goes off to sea to feed. By the time the female returns, the chick, which hatched several days earlier, is ready to be fed and looked after by the female, while the hungry male heads towards the sea to feed.
Penguins - like all birds - don't have babies, they lay eggs.
Breast milk.
After the female and the male mate for one year that's the time the female lay its egg. (early January)
The female cat feeds her babies with her milk.