A remarkable age for a chimp, and a somewhat significant endnote for ZSL: afaik Koko was the last surviving chimpanzee kept at London Zoo before the Sobel Pavilions were demolished to make way for Gorilla Kingdom in the mid-00’s. Chimpanzees can be quite a “marmite” species for some people, but I always found Koko to be a very pleasant individual. I believe she was also a favourite of ex-ZSL boss David Field, who always sought her out on his visits.
With the recent premature passing of Bashu, it’s not been a pleasant few weeks for Whipsnade.