Assertion: inca tern | /r/HasAspect | dark plumage
Facets:
value: mainly
type: DEGREE
Source sentences:
text: Most species are pale grey above and white below, with a contrasting black cap to the head, but the marsh terns, the Inca tern, and some noddies have dark plumage for at least part of the year.
text: The Inca tern has mainly dark plumage, and three species that mainly eat insects, the black tern, white-winged tern, and black-bellied tern, have black underparts in the breeding season.