Assertion: sea otter | /r/CapableOf | use their webbed hind feet
Facets:
value: to propel them
type: PURPOSE
Source sentences:
text: They typically swim belly-up on their backs, propelling themselves through the water using their webbed hind feet.
text: While sea otters use their two webbed hind feet and tail to propel them through the water, the four webbed feet of river otters are what enable them to swim efficiently.