In identifying skulls, the first area of scrutiny is the teeth because dentition signifies diet and helps one to start down the trail toward the correct answer. Tooth variety, shape and arrangement are unique among herbivores, omnivores and carnivores, particularly in terms of molars.
In comparing the dentition of the omnivorous Black Bear (Ursus americanus) and Homo sapiens, one will note both species have square shaped, rather flattened molars, canine teeth and incisors. Square flattened molars in the presence of canine teeth (the instruments of flesh tearing) indicates an omnivore. Surprisingly, the molars of a Black Bear (see photo), although somewhat larger, are remarkably similar to that of a human. And the canine teeth of the Bear are much more long and sharp.
Consider then that Black Bear diet consists of ~25-30% meat leaving the majority of its feeding habits revolving around herbivory. Lesson for humans from the Black Bear – we do not need large quantities of animal based protein to produce a large, strong, muscular body. Additionally, we do not need dairy for calcium – some of the largest land animals in the world eat nothing but greens – Elephants, Giraffes, Rhinoceros, Moose, Hippopotamus…. Got it?