Animal Ethics

If today's human lived alongside other less endowed human species than ours (some sort of Neanderthal or Homo habilis) we would respect their differences and not consider them beings that we can use for our service. However, the fact that the closest species on the evolutionary scale to us, is the chimpanzee, puts us in a more delicate situation: to what extent do they suffer, are they masters of their fates or do they enjoy some features that we attribute only to man? Moreover, some mental...