 Some traditionally popular large games, such as elephant, rhinoceros, tiger and polar bear, are now illegal to hunt due to conservation concerns, but poaching remains a major problem.Hunting of big game for food is an ancient practice, possibly arising with the emergence of "Homo sapiens" (anatomically modern humans), and possible pre-dating it, given the known propensity of other great apes to hunt, and even eat their own species.Based on cave paintings, it appears that early man hunted mammoth in groups, using a combination of spears or large rocks, or alternatively running the animal off a cliff.