Assertion: porpoise's flipper | /r/HasProperty | dorsal fin
Facets:
Source sentences:
text: Their flippers, dorsal fin, tail fin and back are a dark grey.
text: The flippers, dorsal fin, tail fin and back are a dark grey.
text: The flippers, dorsal fin, tail fin and back are a dark grey.
text: the chin, throat and belly are white; the flippers, dorsal fin and back are dark grey to black with the exception of the yellow patch; there is a further white patch below the dorsal fin, lying above a light grey stripe that runs from the beak, above the eye and down to the tail stock.