Assertion: nurse shark's predator | /r/HasProperty | few natural
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Source sentences:
text: The tawny nurse shark has few natural predators; attacks on this species have been reported from bull sharks (Carcharhinus leucas) and great hammerheads (Sphyrna mokarran), while the related nurse shark has been known to fall prey to tiger sharks (Galeocerdo cuvier) and lemon sharks (Negaprion brevirostris).