Assertion: raven's feather | /r/HasAspect | grey bases
Facets:
Source sentences:
text: The upperparts are glossy, with a purple, blue, or green sheen, and its black feathers have grey bases.
text: An adult individual is about 48–50 cm (19–19.5 in) in length, with completely black plumage, beak, and legs; as with all Australian species of Corvus, the black feathers have a grey base, and the iris of the adult bird is white (typical also of some related species from islands to the north of Australia).
text: As with the other two species of raven in Australia, its black feathers have grey bases.