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Nathan Hawke, the zoo's marketing manager, said staff members asked Wright to stop chanting, beating his chest and mimicking the primates, but his behavior persisted.
Wright said officials misunderstood the gorillas' reaction to his presence.
"They weren't agitated at all -- they seemed to be enjoying the singing," he told Stuff.co.nz.
Wright said one of the gorillas came up to the glass to give him a high five, but officials said the gesture was misunderstood by the visitor.
"Their perception is 'it's great, the gorilla high-fived me' [when it slaps] the glass," gorilla keeper Rob Clifford told 3news. "[Or] 'the gorilla played tag with me' which was a shoulder-charge to the glass. It's an uneducated view on what actually happened."
The gorillas, Fataki, Fuzu and Mahali, came to the zoo from an Australian park in late July.