Cyril Ruoso / Ring-tailed Lemur (Lemur catta), Anja Park, Madagascar

Lorraine Bennery / Black lemur (Eulemur macaco macaco) female sitting in tree. Lokobe Reserve, Nosy Be, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) male looking down from branch. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female in tree. Sahamalaza, Madagascar.

David Pattyn / Black and white ruffed lemur (Varecia variegata variegata) hanging from branch, Vakona island, Andasibe area, Madagascar. Captive.

Edwin Giesbers / Blue-eyed / Sclater's black lemur (Eulemur flavifrons) male with arm on female's back, captive, endemic to Madagascar., Critically Endangered.

Bernard Castelein / Black Lemur (Eulemur macaco) male, Nosy Komba, Madagascar

Bernard Castelein / Black Lemur (Eulemur macaco) male, Nosy Komba, Madagascar

Bernard Castelein / Indri (Indri indri) calling, Andasibe-Mantadia NP, Madagascar

Andy Rouse,Andy Rouse / Ring tailed Lemurs (Lemur catta) silhouetted, Madagascar.

Andy Rouse,Andy Rouse / Indri (Indri indri) portrait. Madagascar.

Nick Garbutt / Milne-edward's sifaka lemur (Propithecus diadema edwardsi) infant head portrait, Ranomafana National Park, south east Madagascar.