Assertion: black vulture's vision | /r/HasProperty | the most important sense
Facets:
value: for birds
type: TRANSITIVE-OBJECT
Source sentences:
text: Vision is the most important sense for birds, since good eyesight is essential for safe flight, and this group has a number of adaptations which give visual acuity superior to that of other vertebrate groups; a pigeon has been described as "two eyes with wings".