Important to note that this De Brazza’s Monkey infant is very important (and cute!). The mothers line is under represented in the breeding program while the male is fairly represented as he is part of the Blackpool line. It’s taken a while to mix the male with one of the younger females (both sisters).
I recently read somewhere in one of the EEP 'guidelines' on the management of Guenons that De Brazza's has a larger and more stable population in EEP zoos than some of the other species. They don't appear to be so concerned about its status compared to some of the others (Hamlyn's, Diana etc which continue to dwindle). That's not to say this birth is not a valuable contribution- De Brazza is one of my personal favourites and again not seen in many places in the UK, where there seems only a small breeding pool.