Chien Lee / Minden / White-footed Sportive Lemur (Lepilemur leucopus) in cavity, Madagascar

Nick Garbutt / RF - Ring-tailed lemurs (Lemur catta) back lit and sun bathing at first light. Berenty Private Reserve, southern Madagascar. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / Female ring-tailed lemurs (Lemur catta) carrying infants (3-4 weeks) on their backs across open ground. Berenty Private Reserve, southern Madagascar.

Ernie Janes / Ring-tailed lemur (Lemur catta) two huddled together for warmth. Captive.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) amongst granite rocks in cave. Lemurs lick minerals from the rocks. Anja Community Reserve, Madagascar.

Lorraine Bennery / White-fronted brown lemur (Eulemur albifrons) in tree, Rainforests of the Atsinanana, Marojejy National Park, Madagascar. Endangered species, endemic.

Lorraine Bennery / Red-bellied lemur (Eulemur rubriventer) huddling together in tree branches. Anjozorobe Special Reserve, Madagascar. Vulnerable species, endemic.

Lorraine Bennery / White-fronted brown lemur female (Eulemur albifrons), sitting in tree, Rainforests of Atsinanana, Marojejy National Park. Madagascar, Endangered, endemic.

Lorraine Bennery / White-fronted brown lemur (Eulemur albifrons) climbing tree, looking at camera. Rainforests of the Atsinanana, Marojejy National Park, 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.

Lorraine Bennery / Ankarana sportive lemur (Lepilemur ankaranensis) looking out from hole in tree. Analamera National Park, Madagascar.

Lorraine Bennery / Crowned lemur (Eulemur coronatus) jumping in forest canopy. Analamera National Park, Madagascar.

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

Houdin and Palanque / Pale fork-marked lemur (Phaner pallescens) in search for food at night, Kirindy Deciduous Forest, Madagascar. Lenses for Conservation project.

Houdin and Palanque / Madame Berthe's Mouse Lemur (Microcebus berthae), the world's smallest primate, Kirindy forest, Madagascar. Lenses for Conservation project.

Sandesh Kadur / Bamboo lemur (Hapalmur griseus) sitting on tree stump. Andasibe-Mantadia National Park, Madagascar.

Andy Rouse / Indri Lemur, (Indri indri), in rainforest, Perinet, Madagascar

Klein & Hubert / Red ruffed lemur (Varecia rubra) hanging in banana tree, holding a flower, Masola, Madagascar.

Klein & Hubert / Red ruffed lemur (Varecia rubra) in banana tree, holding stalk of flower, Masaola, Madagascar.

Klein & Hubert / Red-ruffed lemur (Varecia rubra) lying on branch in tropical forest, Madagascar.

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

Nick Garbutt / Male Indri (Indri indri) reaching for leaves / foraging in forest understorey. Mitsinjo Reserve, Andasibe-Mantadia National Park, eastern Madagascar. Endangered.

David Pattyn / Common brown lemur (Eulemur fulvus) jumping amongst branches, Anjajavy Private Reserve, north west Madagascar.

David Pattyn / Common brown lemur (Eulemur fulvus) portrait, Anjajavy Private Reserve, north west Madagascar.

Bernard Castelein / Sanford's brown lemur (Eulemur sanfordi) male and female in tree, Ankarana National Park, Madagascar

Bernard Castelein / Ankarana sportive lemur (Lepilemur ankaranensis), Ankarana National Park, Madagascar

Alex Hyde / Lemur leaf frog (Agalychnis lemur) Central Caribbean foothills, Costa Rica. IUCN Red List critically endangered species.

Klein & Hubert / Ring-tailed lemur (Lemur catta) reaching out to the tail of other lemur, Madagascar

Klein & Hubert / Ring-tailed lemur (Lemur catta) in tree, Madagascar

Suzi Eszterhas / Crowned lemur (Eulemur coronatus) mother with twin infants, East Coast of Madagascar.

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

Edwin Giesbers / Lemur leaf frog (Hylomantis lemur) captive, occurs in Central and South America. Critically endangered.

Klein & Hubert / Red-ruffed lemur (Varecia rubra) hanging in a tree with his tail, Madagascar.

Suzi Eszterhas / Ring tailed lemur (Lemur catta) mother and very young (1-2 week) baby. Berenty Private Reserve, Madagascar.

Suzi Eszterhas / Ring tailed lemurs (Lemur catta) feeding on Spiny forest tree (Didierea trollii).Berenty Private Reserve, Madagascar

Suzi Eszterhas / Ring tailed lemur (Lemur catta) mothers with two-week babies. Berenty Private Reserve, Madagascar

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) foraging in sisal field looking for flowers during a poor year without much fruit. Berenty reserve, Madagascar, September.

Bernard Castelein / Ring-tailed lemur (Lemur catta) female carrying two babies. Anjaha Community Conservation Site, near Ambalavao, Madagascar.

Enrique Lopez-Tapia / Common brown lemur (Eulemur fulvus) in tree. Andasibe-Mantadia National Park.

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

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

Inaki Relanzon / Ring-tailed lemur (Lemur catta) Anja Private Reserve, near Ambalavao, Central Madagascar.

Andy Rouse / Coquerel's Sifaka (Propithecus coquereli) jumping, Palmarium Reserve, Madagascar

Andy Rouse / Verreaux Sifaka (Propithecus verreauxi) mother carrying baby. Madagascar

Andy Rouse / Verreaux Sifaka (Propithecus verreauxi) jumping ('dancing') across ground, Madagascar

Andy Rouse / Verreaux Sifakas (Propithecus verreauxi) jumping ('dancing') across ground, Madagascar