Perhaps the only generally accepted form of cannibalism is when humans eat the flesh of other humans in an attempt to stay alive in adverse and desperate situations. Survival cannibalism is rare and explicable in many cases, yet is still an act that is often punishable by law. There have been several prominent cases of survival cannibalism over the last two hundred years, including that of the Donner Party expedition and the more recent cases that occurred in the Andes Mountains following a plane crash.