Emotion. Its an interesting characteristic that for centuries was thought to indicate a 'soul' or help us better define who we were and how we differ from all the other animals on this amazing planet of ours. Advances in zoology have shed new light on this sometimes confusing subject. We now know that many other animals display human like emotions, most notable in our primape cousins. Although we can see these same emotions in other animals such as lions and dogs, horses and bears, elephants and even in whales. Although, as far as we can tell, emotion does not seem to exist in other species such as reptiles and avi. My question is, does emotion define us mammals?