Mountain lions (Puma concolor) are the largest predators found in the Grand Canyon. There are 18 native South American, 25 native North American, and 40 English names for this species, and the most common are puma, cougar, panther, and catamount. Humans in Grand Canyon have no reason to fear mountain lions because they do not see humans as prey. For mountain lions, being hit by cars is a common cause of death. Please use caution when driving, especially on East Rim Drive.