Assertion: bald eagle's head | /r/CapableOf | become white
Facets:
value: mostly
type: DEGREE
Source sentences:
text: first year juveniles brown with white spotted tail, belly, and underwing feathers; eyes and bill change from black to yellow with age; head and tail become white; full adult plumage reached at 4 – 5 years old
text: Bald eagles become sexually mature at five to six years with maturity usually corresponding to when their head and tail feathers become white.
text: In their 4th year, their body becomes mostly dark and their head and tail become mostly white, with some beige around their eyes and crown and isolated dark spots on their tail.