Assertion: black vulture's head | /r/HasProperty | clean
Facets:
value: by the bird
type: OTHER
value: meticulously
type: MANNER
Source sentences:
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.