Assertion: river dolphin's flipper | /r/HasProperty | e.g. seals
Facets:
Source sentences:
text: Some aquatic mammals with flippers (e.g. seals) are amphibious and regularly leave the water, sometimes for extended periods, and maneuver on land by undulating their bodies to move on land, similar to the up-and-down body motion used underwater by fully aquatic mammals (e.g. dolphins and manatees).