An MMA fighter was offered £370,000 to take on a chimpanzee, with a stark warning about life-changing harm.
Cole Johnson said what began as a joke became an actual bout.
The event looked to have been called off after its website was taken down over safety and trust.
It was later described as a cryptocurrency hoax.
Separately, nine chimpanzees on Ngamba Island chose a baited box on 73 percent of trials when a human pointed, called names and made food grunts.
By itself, pointing had no such effect.