They taunted her tossing things in the enclosure. The enclosure was way to short and no water in the moat. Most recent info is the zoo knew that Tatiana had been "playing with the wall" and could get her paw up onto the edge. They did nothing. She was taunted and the extra adrenalin got her all the way out.

Tatiana was also unfairly raised and the Denver zoo is at fault in part. She was raised with no human contact. It is in humane to raise an animal to be wild when it is going to be living with people.

She did pass others by to get to all three men that were there together. She sought them out. I feel she just wanted to teach them a lesson and not kill but never being socialized to people she treated them as another tiger. The one that died was due to a claw to the throat a tiger killing on purpose goes for the throat or neck but with their teeth.

Tigers can live happily in captivity and even zoos if handled and raised right and the enclosure protect both them and the public. Tatiana was raised and handled all wrong. Most tigers live good lives that's why you don't hear about all the others on the news. Supposedly about 10,000 kept in the US. Even one or two incidents a year isn't even a whole percentage point. Horses kill more people percentage wise.

Someone had a Busch garden tiger show on youtube but I can't find it now. People and tigers interacting and tigers seemed to be having a blast.