Assertion: walrus | /r/HasAspect | an air sac
Facets:
value: under its throat
type: LOCATION
value: in their necks
type: LOCATION
Source sentences:
text: The walrus has an air sac under its throat which acts like a flotation bubble and allows it to bob vertically in the water and sleep.
text: To avoid drowning, the Walrus has air sacs in their necks to help keep their head afloat.
text: Walruses have an air sac under their throat, which helps them float in the water so they can sleep!