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I've been to some really well done zoos where the habitats are similar to what the animals would have in real life. Some of the animals are those that would not survive in the wild so having them in zoos gives them a better quality of life.
Not all zoos are like those and the cramped ones make me so sad. There was a gorilla habitat at a big city zoo 20 years ago where the mom gorilla sat next to the glass staring at the visitors with the saddest eyes. I'll never forget her.