If you think zoos are all about conservation and animals' best interests, think again. Check out this article on zoo killing and note where it says:
"American zoos do cull, and AZA rules allow it."
Also, let's for once be fair. Would you want to live and die a miserable manipulated life in a concrete prison for the alleged (but not actual) benefit of your species? If it isn't okay for you...
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Killing Animals at the Zoo