Humans are now a selection pressure on other species. We are altering the course of their evolution.
In nature, it is the weakest, sickest or oldest individuals that are removed from the population. But human hunters want the animals with the largest bodies, the biggest horns, tusks, manes or antlers to line their pockets or adorn their living rooms and pose for photographs with. In other words, we humans take animals that are in their prime and should be the ones passing on their genes to the next generations.
This unnatural selection has removed animals with certain traits that we find desirable from their ecosystems and the gene pool.
It is not just hunting that does this, indirectly our actions and our infrastructure are resulting in changes to the bodies of other animals. More and more examples of this are emerging. I find it fascinating and slightly terrifying.