Alex Hyde / Red fronted brown lemurs {Lemur fulvus rufus} drinking from pool, Kirindy forest, West Madagascar.

Alex Hyde / Close up of fore foot of Red fronted brown lemur {Lemur fulvus rufus}, Kirindy forest, West Madagascar

Alex Hyde / Indri (Indri indri) portrait, climbing tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Indri (Indri indri) portrait, sitting in tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Diademed Sifakas (Propithecus diadema diadema) family group with baby in tropical rainforest. Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Diademed Sifakas (Propithecus diadema diadema) family group with baby in tropical rainforest. Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Nick Garbutt / Ring-tailed Lemur (Lemur catta) sun basking at dawn. Berenty Private Reserve, southern Madagascar.

Nick Garbutt / Three Ring-tailed Lemurs (Lemur catta) sun basking at dawn. Berenty Private Reserve, southern Madagascar. (digitally stitched image)

Edwin Giesbers / Portrait of Red ruffed lemur (Varecia variegata ruber) Captive, Netherlands.

Edwin Giesbers / Sclater's black lemur (Eulemur macaco flavifrons) Captive, the Netherlands. Critically Endangered.

Andy Rouse / Verreaux's sifaka (Propithecus verreauxi) running carrying baby, Berenty Private Reserve, Madagascar

Inaki Relanzon / Verreaux's Sifaka (Propithecus verreauxi verreauxi) 'dancing' as it crosses open ground, Berenty Private Reserve, south Madagascar, May