Assertion: black vulture's neck | /r/HasProperty | clean
Facets:
value: by the bird
type: OTHER
value: meticulously
type: MANNER
Source sentences:
text: The adult plumage is uniformly black, with the exception of a frill of white feathers nearly surrounding the base of the neck which are meticulously kept clean by the bird.
text: The head and neck are meticulously kept clean by the bird, and their baldness is an adaptation for hygiene, allowing the skin to be exposed to the sterilizing effects of dehydration and ultraviolet light at high altitudes.