The Evolution of Human Suffering

I'm not so clear that human beings are going to have a greater capacity to suffer. We know that non-human animals have some senses that are more acute than ours. It's not at all impossible that because of their need to live in sharp contact with the world to evolve that animals have capacities to feel pain that are just as acute or more acute than our own. But we shouldn't take it as a rule of thumb that humans always suffer more than animals and certainly not that human suffering matters more, which is really the point about speciesism.