Assertion: horseshoe crab's tail | /r/ObjectUse | used as rudder
Facets:
Source sentences:
text: Horseshoe crab has long, rigid tail that is used as a rudder and to rotate animal from the back to the feet when it flips over.
text: The tail is also used as a rudder while the horseshoe crab is swimming.
text: The tail (called a telson or caudal spike) is also used as a rudder when moving underwater.
text: The long tail is used as a rudder while swimming, and also to flip the animal over if it becomes trapped on its back on the beach.