Assertion: plesiosaur | /r/CapableOf | use their head
Facets:
value: as a rudder
type: PURPOSE
value: to change directions
type: PURPOSE
Source sentences:
text: While it is possible that plesiosaurs used their head as a rudder to change directions while swimming, it would also be nearly impossible for them to swim in a straight line with their heads darting from side to side, or up and down, in search of prey as shown in many reconstructions.