: An updated model emphasizing the promotion of positive welfare experiences, such as companionship and play. 2. Philosophical Shift: Animal Rights
This is a shift from utilitarianism (calculating the greatest good for the greatest number, often sacrificing the individual) to deontology (moral duties). Under a rights framework, you cannot sacrifice the life of a chimpanzee for a medical experiment, no matter how many human lives it might save, because the chimp has a right to bodily integrity that cannot be violated. 3d bestiality comics link
Philosophy provides the argument, but science provides the evidence. The wall separating humans from animals is being dismantled by ethology, the study of animal behavior. : An updated model emphasizing the promotion of