Why does an animal do what it does with such amazing ability

I have had this for quite some time and I watch it often. As there was some discussion the other day about the tiger that jumped out of it's moated enclosure at the San Francisco Zoo, and killed and injured 2 people, and I suggested that they will be discussing "why" for a long time to come. Personal answers depend on what side of the issue you are on, and they will range from starvation to poor design, to people teasing them, to drugs and alcohol, to poor directorship, to you shouldn't keep animals in a cage anyway. The qualified to discuss it ,will discuss it much longer, and will maybe never stop discussing what motivates an animal to do what it does.
Before anybody tells me this bull was trying to escape because he was scared and knew he was going to die. Wrong. He looks left, looks right, and in a blink make the decision to go. That is the incredible mystery of animals.
A young contemporary asked me last night, if an animal does something what is the chance it will do it again. I will remind him, the reason why a bull is killed and not fought twice, is that the Matador bases his strategy for the fight on the assumption that the bull will not know what he(the Matador) is going to do, and they will have figured out a Matadors moves by the second fight.
http://www.youtube.com/watch?v=ljT3hSuLt24