Assertion: osprey's feather | /r/HasProperty | oily
Facets:
value: very
type: DEGREE
value: for extra waterproofing
type: PURPOSE
Source sentences:
text: Ospreys have oily feathers to avoid getting waterlogged while grappling with fish (it can take several attempts to lift big prey).
text: Their feathers are also very oily for extra waterproofing as they plunge into the water.
text: …their feathers are also very oily for extra waterproofing as they plunge into the water.