The idea that non-human animals have significant moral status is comparatively modern. It owes much to the work of philosopher Peter Singer and his 1975 book 'Animal Liberation'. Animal lovers ...

It is almost never acceptable to exploit or use animals in a way that is not in the best interests of the animals concerned. Human beings should aim to treat animals in the way that is best for ...

Much like we are now beginning to feel that there is something wrong with how we treat animals, perhaps some of our ancestors also had a feeling that what they were doing was wrong.