Assertion: octopus's mouth | /r/AtLocation | the underside
Facets:
Source sentences:
text: The sack-like body is perched atop the head, which has two complex and sensitive eyes, while the mouth is on the underside.
text: The bulbous sack-like body, or mantle, is perched atop the head; the mouth and beak are on the underside, where the arms converge.