Tony Heald / Malayan colugo (Cynocephalus variegatus) hanging upside-down in tree feeding on algae at night, Danum Valley, Sabah, Borneo, September

Chien Lee / Sunda flying lemur (Galeopterus variegatus) mother with young, Bako National Park, Sarawak, Borneo, Malaysia

Chien Lee / Sunda flying lemur (Galeopterus variegatus) mother with young, Bako National Park, Sarawak, Borneo, Malaysia

Nick Garbutt / Sunda flying lemur (Cynocephalus variegatus) red colour morph, in daytime resting posture. Danum Valley, Sabah, Borneo.

Anup Shah / Colugo or 'Flying Lemur' female and baby clinging to a tree (Cynocephalus variegatus). Bako National Park, Sarawak, Borneo, Malaysia.

Anup Shah / Malayan flying lemur (Cynocephalus variegatus) mother and baby clinging to tree, Bako National Park, Sarawak, Borneo, Malaysia

Chien Lee / Malayan flying lemur (Cynocephalus variegatus), Bako National Park, Malaysia

Suzi Eszterhas / Malayan flying lemur (Cynocephalus variegatus) at night, Danum Valley Conservation Area, Malaysia

Jeff Wilson / Head portrait of a Colugo / Flying lemur (Galeopterus vairegatus) in Bako National Park, Borneo, filmed for BBC Planet Earth series, Jungles episode. 2006

Jeff Wilson / Director, Jeff Wilson, tracking Colugo / Flying lemurs (Galeopterus vairegatus) in Bako National Park, Borneo, filmed for BBC PLanet Earth series, Jungles episode. 2006

Nick Garbutt / Malayan colugo / Flying lemur (Cynocephalus variegatus) feeding on algae on tree bark. Danum Valley, Sabah, Borneo, Malaysia

Nick Garbutt / Colugo / Flying lemur (Cynocephalus variegatus) resting on trunk at dusk. Bako NP, Sarawak, Borneo, Malaysia