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Its pretty clear you are the one needed to be educated. Perhaps not so much giraffes, that was probably a bad example. However, there are animals what could easily get out of their cages. (Electric would go off, causing electric fences to be useless.) This is a plausible way as to how animals could be in new environments and countries, i assume your education system must be very bad, you live in America by any chance?
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You act as if zoo animals make up the larger population of whatever species you're referring to. In reality, zoo animals would die and within months of no human interaction on earth, it would most likely be in a significantly better place in terms of the world's ecosystems. You keep making these wild assumptions about what would happen, almost none are true. I think it's safe to say about 99% of all animals inhabiting this earth are independent species that don't rely on anything (especially humans) for survival.