Sadly, it probably would be. Most of these animals are injured, or were born in captivity. They don't know how to survive elsewhere. It'd be great if we could just let them go randomly, but they probably would end up getting hurt or killed, or die of starvation, not knowing how to find food. There's a lot of work involved in getting an animal introduced in the wild. We don't just keep them at the zoo for fun.
As for the birds, honestly? If they didn't want to come back, they wouldn't. For most of them, the zoo's the only home they've ever known.
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As for the birds, honestly? If they didn't want to come back, they wouldn't. For most of them, the zoo's the only home they've ever known.