He looks so sad when teamed with the title. I almost wrote something else here because it took a minute for it to settle in. I'm not sure if adding text is allowed in the advanced editing but if you added the word captivity in a subtly way this might have been more obvious.
Great job turning a drawback of the environment into a focal point of the picture using the title.
What a poignant picture . . you are right that sometimes this is the only way of keeping them alive, but looking at his face, it seems to be at a cost . .
Great composition and expression on the monkey. I like the background colors but think the colors of the monkey need to be adjusted to make him stand out more. I like the fact that you have the chain link fence showing in the foreground. That gets the meaning across.