This shows the comparison of the amount of space animals have to live in the wild versus captivity. As you can see, theres quite a difference.
This is a picture of Harambe, a gorilla murdered at the Cincinnati Zoo because of the mistakes of humans.
Zoos are busy areas, causing unnatural and loud sounds that the animals must listen to all day long.
Animals rely heavily on their sense of smell and are sometimes placed in cages near that of their predators. Therefore, they must smell their predators constantly and are not able to move away, which can be extremely distressing.
This picture represents the emotional strain on the animals that are kept in captivity.