Red-fronted Brown Lemur (Eulemur rufus), Andasibe-Mantadia National Park, Madagascar, Africa

Greater bamboo lemur (Prolemur simus), Parc National de Ranomafana, Ranomafana, Central Madagascar, Africa

A brown lemur with a long tail walking on a rope in a dark environment.

Ring-tailed lemur (Lemur catta) on cactus, near Threatened, Berenty Nature Reserve, Madagascar, Africa

Greater bamboo lemur (Prolemur simus), Parc National de Ranomafana, Ranomafana, Central Madagascar, Africa

Red-fronted brown lemur (Eulemur rufifrons), Ranomafana National Park, central area, Madagascar, Africa

Red-fronted Brown Lemur (Eulemur rufifrons), Berenty Private Reserve, Madagascar, Africa

Greater bamboo lemur (Prolemur simus), Parc National de Ranomafana, Ranomafana, Central Madagascar, Africa

Common brown lemur (Eulemur fulvus), Lemur Island, Andasibe National Park, Madagascar, Africa

Red-fronted Brown Lemur (Eulemur rufus), Andasibe-Mantadia National Park, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus), Andasibe, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus), Andasibe, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus), Andasibe, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus), Andasibe, Madagascar, Africa

Common brown lemur, Isalo, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus), Andasibe, Madagascar, Africa

Common brown lemur (Eulemur fulvus) at Lemur Park, Madagascar, Africa

Red fronted brown lemur (Eulemur rufifrons), Ranomafana National Park, Madagascar Central Highlands, Madagascar, Africa

Male red-fronted brown lemurs (Eulemur fulvus rufus) in the Kirindy Forest reserve in southwest Madagascar, Madagascar, Africa

White-fronted brown lemur (Eulemur fulvus albifrons) in the rainforest of Marojejy National Park in northeast Madagascar, Madagascar, Africa

Female red-fronted brown lemur (Eulemur fulvus rufus) in the Tsingy De Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

Red-fronted Brown Lemur in Isalo National Park, Madagascar.

Brown Lemur (Eulemur fulvus), Andasibe Reserve, Perinet Reserve, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus fulvus), adult male on a tree, Madagascar, Africa

Red-fronted Brown Lemur (Eulemur fulvus ssp. rufus), adult jumping from tree to tree, Berenty Game Reserve, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus fulvus), adult male on a tree, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus fulvus), adult male on a tree, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus fulvus), adult male in a tree, Madagascar, Africa

Common Brown Lemur (Eulemur fulvus fulvus), adult male in a tree, Madagascar, Africa