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The rewilding work involves numerous technical issues and is subject to many conditions; every release, even with thorough preparation, presents a significant challenge for zoos and research institutions. For the animals being released, it's even a gamble with their lives. Hence, wildlife organizations, both domestic and international, are extremely cautious when it comes to rewilding.
Rewilding is infrequent and difficult. There is also a very inconvenient truth that's hard to express: while in the zoo, animals are assets capable of generating economic income, but once released, they become wildlife.
'Protecting animals, protecting the environment'—it's easy for everyone to say these things, but when you actually ask a zoo to let go of the animals they've spent considerable effort and money on, it hurts like cutting your own flesh!
Suming's goal wasn't simply to release one or two, or even just a handful of animals; he planned to release all that could be released.