Indeed they do, “The hen must go and feed from time to time, so the cock (the male bird) may take over.” Though, this is particularly important for one species of bird, the emperor penguin. “It is the male bird that looks after the egg to begin with. The hen lays only one large egg per year. She uses up a lot of her food reserves to make this egg, so she must go to sea to fish for food to replace these reserves. The male stays on the ice and keeps the egg on his feet covered by a fold of skin.”
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