The Prindle Post
Human beings have long treated animals not as sentient beings, but as objects or products to be used and consumed. We do this in spite of the fact that animals demonstrate every sign of having mental lives. We have the same reasons to believe that animals have mental lives that we do to believe that other human beings have mental lives; the best evidence we have is behavior. Humans report having affection for animals. Nevertheless, we intensively farm them for food and use them for medical experiments, activities which are quite painful and lead to suffering, permanent disability, and/or death. Engaging in these activities requires compartmentalization and moral disengagement.
Robison-Green, Rachel. "The Ethics of Animal Dis-Enhancement.". The Prindle Post. https://www.prindlepost.org/2021/06/the-ethics-of-animal-dis-enhancement/