Observations of modern hunter-gatherers have shown that muscle meats (the leanest part of the animal) are least preferred, sometimes even being thrown away in times of plenty, in preference to the fattier portions. Eaten first are the organs such as brains, eyeballs, tongue, kidneys, bone marrow (high in monounsaturated fat), and storage fat areas such as mesenteric (gut) fat. (Even this gut fat is much less saturated in composition, however, than the kind of marbled fat found in the muscle meat of modern feedlot animals.) There is no reason to believe earlier hunter-gatherers would have been any different in these preferences, since other species of animals who eat other animals for food also follow the same general order of consumption.