Assertion: penguin's layer | /r/Synonym | a brood pouch
Facets:
Source sentences:
text: Males have a layer of skin called a brood pouch, which serves to keep their eggs nice and warm.
text: To make sure that the eggs are warm enough to have, male Emperor penguins will hold the eggs on their feet and then cover the egg up with a layer of skin that is called a brood pouch.
text: Careful to keep the egg sheltered, the male will balance the egg on his feet and cover it with a warm layer of feathered skin called a brood pouch.