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.
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.
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.
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.