And you failed
These reserves are often huge areas, sometimes more than one contingent to another or more. It’s impossible for the caretakers to monitor everything all the time.
Back in 1980, I stopped at a million acre ranch owned by a Texan. He had very good fences (”Elefence”) and a private game warden force. As a result, he had more rhino and elephants than his land would support.
He offered to give these excess endangered animals to the Kenya Wildlife Service. They declined to take these rhino & elepheants, saying “We could not keep them alive.”