Assertion: penguin's skin | /r/Synonym | a brood pouch
Facets:
Source sentences:
text: He does not sit on it, but keeps it on his feet where a very warm layer of feathered skin called a brood pouch protects it.
text: Males stand and protect their eggs from the elements by balancing them on their feet and covering them with feathered skin known as a brood pouch.