" our view of ourselves as postevolutionary, purely cultural creatures, standing outside of selective pressures and in control of our fate is wrong. We tend to think that humans evolved, then stopped evolving and started culture. Far from it. The onset of agriculture and the flowering cultures of civilization were themselves enormous changes in the human environment, massively altering selective pressures. Pressures to maintain a hunter’s size and strength and senses relaxed, while pressure to behave cooperatively, expand social skills, and suppress violent urges intensified. "

― Carl Safina , Beyond Words: What Animals Think and Feel