Zoo staff began surveillance of his enclosure to try to catch him in the act, only to find that he seemed to be aware that he was being watched. This forced zookeepers to go "undercover", posing as tourists to learn Ken Allen's escape route, but the ape was not fooled.
To capture him in the act, zoo staff began monitoring his enclosure; however, they found that he seemed cognizant of their surveillance. This necessitated zookeepers adopting undercover methods, posing as tourists to learn Ken Allen's escape plan, yet the ape remained undeluded.