Assertion: heron's back | /r/HasProperty | grey-black grading
Facets:
value: into blue
type: OTHER
value: into green
type: OTHER
Source sentences:
text: Adults have a glossy, greenish-black cap, a greenish back and wings that are grey-black grading into green or blue, a chestnut neck with a white line down the front, grey underparts and short yellow legs.