 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 ) . Known parasites of this species include five species of tapeworms in the genus Pedibothrium , which infest the shark 's spiral intestine . 
 The tawny nurse shark <a href='got' title='1'><mark>has</mark></a> few natural predators ; attacks on this species <a href='been_done' title='2'><mark>have</mark></a> been reported from bull sharks ( Carcharhinus leucas ) and great hammerheads ( Sphyrna <a href='uninflect' title='3'><mark>mokarran</mark></a> ) , while the related nurse shark <a href='been_done' title='4'><mark>has</mark></a> been known to fall prey to tiger sharks ( Galeocerdo cuvier ) and lemon sharks ( Negaprion brevirostris ) . Known parasites of this species include five species of tapeworms in the genus Pedibothrium , which infest the shark <a href='null_genetive' title='5'><mark>'s</mark></a>spiral intestine . 
The tawny nurse shark got few natural predators ; attacks on this species done been reported from bull heats ( Carcharhinus leucas ) and great hammerheads ( Sphyrna mokarraned ) , while da related nurse shark done been known to fall prey to tiger sharks ( Galeocerdo cuvier ) and lemon sharks ( Negaprion brevirostris ) . Known parasites of this species include five species of tapeworms in tdagenus Pedibothrium , which infest the shark  spiral intestine .