Did you see one, or a pair of these Monkeys? Last year there were two but I'm not sure they still have both of them. This looks like the male- he is a very nervous animal, often glancing upwards as he appears to be doing in this photo.
There was a pair. Also managed to catch a glimpse of the single Crowned Guenon (Cercopithecus pogonias) that shares the house. It presumably alternates with the Hamlyns in the outdoor enclosure but only had access to the little run between the house and outdoor exhibit. First time I'd seen it for some time.
The Hamlyn's were shut in the back today and the Crowned was in the outdoor area - so I can confirm that they do alternate. Photos of the Crowned in the exact same spot as the Hamlyn's above: http://www.zoochat.com/41/crowned-guenon-twycross-04-07-09-a-90354/ http://www.zoochat.com/41/crowned-guenon-twycross-04-07-09-a-90353/
