Stephen J. Gould

Ever Since Darwin: Bibliographical Excerpts

"Both herbivores and carnivores displayed continual increase in brain size during their evolution, but at each stage, the carnivores were always ahead. Animals that make a living by catching rapidly moving prey seem to need bigger brains than plant eaters. And, as the brains of herbivores grew larger (presumably under intense selective pressure imposed by their carnivorous predators), the carnivores also evolved bigger brains to maintain the differential." (Gould, SJ (1977) Ever Since Darwin. W. W. Norton: New York p. 190)