Assertion: porpoise's body | /r/HasProperty | dark gray
Facets:
value: usually
type: DEGREE
Source sentences:
text: Sei Whale’s body is dark gray with white markings on the ventral surface.
text: The body of the Dall's porpoise is dark grey or black with white panels, and can be distinguished from all other dolphins by the white "frosting" on his tail flukes and dorsal fin.
text: The body is usually black or dark-gray above and white underneath.