I've found an annual report for Twycross 2005. The last quote may explain the lack of baby guenon babies.
We were disappointed that we had a still-born woolly monkey and also that we lost the female L'Hoest's monkey as she was giving birth.
Two animals had to be euthanised. The first being our two-year old baringo giraffe. This animal was on loan from Paignton Zoo and had developed a severe hip problem. The second was a hand reared dusky langur, whose health drastically deteriorated at eight months old.
We also sent a male crowned lemur to Overloon in the Netherlands, a purple-faced langur to Belfast Zoo and a pair of Whiteside's guenons to La Plaine. These two animals were to join eight others of the same species, which have been gathered together in the hope of stimulating breeding of this species which is currently dying out in captivity and not doing too well in the wild.
Contraceptionm amongst primate groups remains essential in many instances - we may not have space for groups to expand furthur or it may be the best way to ensure that only the right couples mate within the captive breeding programmes that are such a keystone of modern zoos.
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) There could be other Guenon species that need similar management too.
