Assertion: whale's ridge | /r/ObjectUse | used with the head
Facets:
value: for pushing up against ice
type: PURPOSE
Source sentences:
text: The lack of fin is an adaptation to swimming under sea-ice when it might get caught or damaged, the ridge performs a similar job and is also used with the head for pushing up against ice to break through.
text: The lack of fin is an adaptation to swimming under sea-ice when it might get caught or damaged, the ridge performs a similar job and is also used with the head for pushing up against ice to break through.