Assertion: porpoise's fin | /r/CapableOf | sit in the middle of its back
Facets:
Source sentences:
text: It has a small, triangular dorsal fin that sits approximately in the middle of its back.
text: The common characteristic features of this family include the presence of noticeable beak, conical-shaped canine-like teeth, and the large falcate dorsal fin situated near the middle of the back.