Kagan feared that the backlash from the Harambe incident could cause zoos to move backward in their treatment of animals - and their hard-won naturalistic enclosures. "When there's an intention to go into an enclosure, it's almost impossible to prevent that," Kagan said.
The zoo has since erected a taller, nylon mesh fence around "Gorilla World," where Harambe died.
Because of illegal hunting, habitat loss, disease and climate change, Western lowland gorillas are critically endangered - only an estimated 100,000 are left on Earth.
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