Assertion: gull | /r/CapableOf | pick up the oil
Facets:
value: by rubbing the preen gland
type: MANNER
Source sentences:
text: By rubbing the preen gland with its beak, the gull picks up the oil and then distributes it onto its feathers by rubbing its beak over the feathers, It is possible that the oil from the preen gland also helps to make the feathers supple and strong and prevents them from drying out.