It is kind of foreseeable that wild animals may act like a wild animals sometimes. There they are, caged, poked & prodded, made to do tricks. Some of 'em just get fed up. I figure that some of us would react the same way.
They use whips and cattle prods to make them cooperate; it's cruel and degrading. I think it's very selfish to put these animals through that so we may be entertained. I'm not a circus fan.
I hope I get this right: "The question should not ask whether animals think. It should ask whether they can feel." John Stuart Mill.