That would make absolute sense, although the first time I saw a white-naped mangabey, I couldn't place it, as it didn't resemble anything I'd seen. The pair were definitely much darker than any White-naped animals since seen, in fact I had always remembered them as black mangabeys, not realising Sooty mangabeys were much lighter in colour. It's interesting, as the most likely explanation is that they were in fact white-naped, with the male surviving through until the son of the previous owner took over and started putting things right in the collection. The memory is a strange thing, can anyone shed any more light on this? Does anybody on this forum remember a mangabey pair in the early nineties? They were housed not in the main monkey cages, but in one of a pair of cages, back to back, with the other holding a lynx and facing the polar bear pool, and the mangabeys facing down the hill towards the rollercoasters behind the current rhino area.