I want to discuss koko the monkey. This monkey is fluent in American Sign Language, with common use of 1000 different symbols. When koko was young, she had a kitten. I am not sure how, but this kitten was accidentally killed. For several months, koko showed all the signs of depression and grievience that humans show. koko has gotten over it, and got a new kitten, but every once in a while, she will start to act very solemn and will talk about how much she misses her first kitten and how much she loved it. It was long hypothesized that emotions were the barrier between us and the rest of the animal kingdom, but these days, any reputable psychologist, anthropologist, or any other social scientist will tell you that the only difference is that animals do not have any OBSERVABLE culture on the same level as we do. Animals undoubtedly have emotions. You can argue all you want, but I'll trust my professors and the other experts. Also, realize that there is an extremely thin line between emotion and instinct (if not non-existent).