First of all, don't use PETA as your source. They kill more animals then they save so I dunno why anyone still supports them.
Secondly I think it depends on the kind of circus the animal is at. Some animals who don't know any better like to perform and can be seen being bored and having the urge to perform when they havn't done so for a while.
I have worked at a facility that houses tigers and lions that, among other places, came from circuses and were given a nice retirement instead of being killed or whatever. Whenever we got new animals, you'd see traces of habit and boredom in the animals. I remember a certain tiger we had one day that spent certain hours of the day doing tricks in his cage. He would jump from log to log, back and forth, for about 15 minutes and after that he'd get on his hind legs and walk a few steps forward. He did all this all on his own without any provocation, except for me watching outside the cage. In a way I could see how he was happy after he did those things, he'd go to a corner and sleep with a content expression on his face. This specific tiger was 14 years old when he came with us and had been with the circus all his life.
Animals in circuses is not automatically animal cruelty. It's a case by case basis.
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