 During the day, groups of two dozen or more sharks can be found resting inside caves and under ledges, often stacked atop one another.Individual sharks have small home ranges that they consistently return to each day.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").