Assertion: alligator | /r/CapableOf | move its tail
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Source sentences:
text: In order to start a death roll, the alligator must be able to flex its flat, muscular rudder of a tail – if it can’t move its tail it can’t start a death roll, which is one of the reasons that people capturing an alligator make sure to sit on or otherwise immobilise its tail as well as its jaws!