As someone who has an interest in primate biology, behavior, and evolution I'm rather shocked I've never heard of these critters! Flying monkeys!!! Well...not monkeys, relatives of primates. Just need the Tin Man, Scarecrow, and the Cowardly Lion, and we're in the world of Oz!
Colugos (/kəˈluːɡoʊ/)[2][3] are arboreal gliding mammals found in Southeast Asia, whose closest non-colugo relatives are primates. Just two extant species[1] make up the entire family Cynocephalidae (/ˌsaɪnoʊˌsɛfəˈlaɪdi, -ˌkɛ-/)[4] and order Dermoptera. They are the most capable gliders of all gliding mammals, using flaps of extra skin between their legs to glide from higher to lower locations. They are also known as cobegos or flying lemurs, but they are not true lemurs, simply close relatives to primates.