evidence: Israeli researchers studying the nutrition of Stone Age humans say the species spent some 2 million years as hyper-carnivorous "apex predators" that ate mostly the meat of large animals. [...] The researchers blended genetics, metabolism, physiology, morphology and archaeology of tool development to resolve the question of whether Stone Age humans were specialized carnivores or generalist omnivores. [...] "As Darwin discovered, the adaptation of species to obtaining and digesting their food is the main source of evolutionary changes, and thus the claim that humans were apex predators throughout most of their development may provide a broad basis for fundamental insights on the biological and cultural evolution of humans," Barkai said.