Assertion: peacock's tail | /r/CapableOf | elongate upper tail coverts
Facets:
value: highly
type: DEGREE
Source sentences:
text: The peacock “tail”, known as a “train”, consists not of tail quill feathers, but highly elongated upper tail coverts.
text: The tail has long, ornamental feathers (not true tail feathers but elongated upper tail coverts) with black eye-spots on the rounded tips.