As far as I can see there are no references on ZTL of any European zoo ever holding colugo, and I presume that like pangolins and tarsiers they are hard or even impossible to maintain. Have zoos in other parts of the world ever kept them? Have any zoochatters ever seen one, either in captivity or even in the wild?
They have been kept infrequently and unsuccessfully in southeast Asia. There's some information regarding captivity on this photo thread: colugo (Cynocephalus variegatus) | ZooChat There are quite a few photos of wild animals in the gallery from Malaysia and Singapore.
I know of two unsuccessful attempts to keep colugos in captivity in North America. Crandall (1964) records a Philippine flying lemur that arrived in New York on 9th July 1947 and only lived two or three days. According to Crandall, it was perhaps the only living specimen to be seen alive outside its native habitat. In his book on captive mammal longevity records, Weigl (2005) records a Malayan flying lemur that lived three days in Lincoln Park Zoo, Chicago, in 1971. (However, In the same book, Weigl also records a Philippine flying lemur, still alive in February 1991, after four years and five months in captivity at the University of the Philippines.)