Assertion: humpback whale | /r/CapableOf | use their massive tail fin
Facets:
Source sentences:
text: Humpbacks are powerful swimmers, and they use their massive tail fin, called a fluke, to propel themselves through the water and sometimes completely out of it.
text: Humpbacks are powerful swimmers, and they use their massive tail fin, called a fluke, to propel themselves through the water and sometimes completely out of it.