At the edge of a sprawling grassland, a pair of hoofed grazers resembling horses, an antelopelike notoungulate and a ground sloth feed quietly, oblivious to their impending doom.
A healthy breakfast should include a variety of whole grains, fruits, vegetables, dairy products from grass-fed animals, and proteins like organic eggs.
So humans are widely thought of as natural omnivores, but some believe that humans are at their optimal health when following the dietary habits of an herbivore.