What makes a human more intrinsically valuable than an animal is simple. You are more closely related to any human, as opposed to any animal. So for the very simple prospect of furthering your common genetic survivability, the choice of human, over animal is quite simple. It's the very same mechanism that makes people more protective of their own children, than the children of strangers. This basic survival instinct is innate in all normally metered people. The fact that you had to have it explained to you, lends credence to your psychotic personality disorder...