Well, to determine if 'Caged Animal' is a true story, you'd need to look at the author's notes, research related information, or check for any claims of it being based on reality. Without that, it's hard to say for sure.
The 'Caged Animal True Story' could be related to scientific research as well. There have been cases where animals are caged for experimentation purposes. It could be the account of one such animal, its experiences, and how it was finally set free or what changes were made to improve its situation in the cage.
A parrot is also a possibility. Parrots are often captured from the wild and caged as pets. There are true stories of parrots being rescued from illegal pet trade. These beautiful birds need a lot of space and freedom to fly, and being caged can cause them a great deal of stress.
One example could be the story of Keiko, the orca whale. Keiko was captured from the wild and put in a small tank for entertainment purposes. He was caged in a way that was far from his natural ocean environment. However, later there was a huge effort to rehabilitate him and eventually release him back into the wild.
I'm not sure which specific 'Caged Animal Based on a True Story' you are referring to. There could be many works with such a title. It might be a documentary about an animal that was caged in real - life situations, perhaps highlighting issues like animal cruelty or conservation.