Mambie
I found this in a 2000 edition of Zoo News (in the days before they just regurgitated news from the website for the magazine and actually provided interesting information):
"Mambie, unlike Asato, had never been in close proximity to a silverback before, having been handreared at Twycross and therefore less familiar with the finer details of gorilla etiquette. Needless to say, he read the signs all wrong and on his first meeting with Pertinax tried to attack him, albeit out of nervousness as opposed to out and out aggression. Not the brightest of ideas, especially as Pertinax only wanted to establish his dominance at the top of the pecking order by pinning him down briefly and then letting him go.
Fortunately for Mambie the others would indeed come to his rescue under the impression that he was being attacked, and would chase off Pertinax in no uncertain terms, but without actually making physical contact with him. At that point, with no harm done, we thought we were going to be able to leave all five (Richard, Awali, Pertinax, Asato, Mambie) together, with the youngsters having bolt-holes to which they could retreat if need be, but Mambie regrettably would persist in screaming if Pertinax so much as looked at him resulting in the others chasing Pertinax for no good reason.
Soon after this stage, the whole group went down with 'tummy bugs' which was no doubt in part due to the tensions caused by Mambie's unsettling presence. Asato had already wisely capitulated to Pertinax on being caught for the first time, so it was decided to try and keep Mambie out of the scene for a while and try to get Asato fully accepted by Pertinax and then reintroduce Mambie.
This met with moderate success, but it was soon quite apparent that Pertinax was even less pleased with Mambie being out of the group where he couldn't get to him such that his frequency of displaying caused even Richard to beat a hasty retreat from the show den! As a result we changed our approach and in November re-established Mambie back in with the other younger males in the hope that given more time his confidence will grow and he will cease to be a source of disruption."
It's obviously not easy being Pertinax!