I spent my 45 minutes observing the big cats. What stuck with me the most was their hilarious similarity to our domesticated feline friends. I assume it's because they are in the zoo and that if we saw these cats in the wild it'd be a different story. One tiger was roaring at something at the beginning of my observation. It sounded kind of sad to me, but I never figured out what was causing it to do that. It was fascinating to me to notice the similarities in the behavior of all felines--big and small. They all have the same "cattitude" and mannerisms.