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

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

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

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

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

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

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) mother with young drinking, Anja Park, Madagascar

Konrad Wothe / Ring-tailed lemur (Lemur catta) with baby feeding from very thin branches, Berenty Reserve, Madagascar.

Chien Lee / Ring-tailed Lemur (Lemur catta) mother carrying young, Berenty Private Reserve, Madagascar

Chien Lee / Ring-tailed Lemur (Lemur catta) mother carrying young, Berenty Private Reserve, Madagascar

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

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

Suzi Eszterhas / Ring tailed lemurs (Lemur catta) feeding on Spiny forest tree (Didierea trollii).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.

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

Suzi Eszterhas / Ring-tailed Lemur (Lemur catta) mother drinking with baby on back, Berenty Private Reserve, Madagascar

Suzi Eszterhas / Ring-tailed Lemur (Lemur catta) mother and week-old twins, Berenty Private Reserve, Madagascar

Bernard Castelein / Ring-tailed Lemur (Lemur catta) Anjaha community conservation site, Ambalavao, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) mother with baby clinging to her back, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) eating Opuntia (Opuntia sp) cactus, introduced from South America, it became a very important food subsistance for Lemurs, cattle and even humans, vulnerable, Berenty P...

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) resting on a tree branch, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) group huddles for warmth as they sleep, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) male warming himself in the sun, vulnerable, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) portrait, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) baby riding on mother's back, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) troop walking down dirt road, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) eating a flower, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) calling, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) two adults and a baby, vulnerable, Berenty Private Reserve, Madagascar

Andy Rouse,Andy Rouse / Ringtail Lemurs (Lemur catta) playing. Madagascar.

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

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

Andy Rouse,Andy Rouse / Ring tailed Lemur (Lemur catta) mother carrying baby on back. Madagascar.

Barrie Britton / Ring-tailed Lemur (Lemur catta) mother and baby Berenty, Madagascar. Photograph taken on location for BBC 'Wild Madagascar' Series, September 2009.

Mark Carwardine / Ring-tailed lemur {Lemur catta} baby on mother's back, portrait, Berenty Private Reserve, southern Madagascar

Mark Carwardine / Ring-tailed lemur {Lemur catta} baby on mother's back, portrait, Berenty Private Reserve, southern Madagascar

Nick Garbutt / Young Ring-tailed lemur (Lemur catta) 6-8 weeks, clinging to mother, Berenty Private Reserve, southern Madagascar, November

Nick Garbutt / Young Ring-tailed lemur (Lemur catta) 6-8 weeks, clinging to mother, Berenty Private Reserve, southern Madagascar, November

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)

Jasper Doest / Ring-tailed Lemur (Lemur catta) mother with young, Netherlands

Fiona Rogers / Ring-tailed Lemur (Lemur catta) infant (less than 1 month) chasing tail of adult lemur. Berenty Private Reserve, Madagascar. Oct 2008.

Fiona Rogers / Ring-tailed Lemur (Lemur catta) male greeting infant. Berenty Private Reserve, Madagascar. Oct 2008.

Fiona Rogers / Ring-tailed Lemur (Lemur catta) female carrying baby one her back, sitting and alert. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) male wrist-marking the tail, lip lared and ears back, during territorial confrontation. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) male scent marking. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) female with infant (less than one month) portrait. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) female with infant (less than one month) portrait. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) female with infant (less than one month) riding on her back. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) 'sunning' in the early morning light to warm themselves. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) female carrying baby and scent marking. Berenty Private Reserve, Madagascar. Oct 2008.

Anup Shah / Ring-tailed Lemur (Lemur catta) female carrying infant less than one month on her back. Berenty Private Reserve, Madagascar. Oct 2008.

Edwin Giesbers / Ring-tailed lemur (Lemur catta) with young, Berenty Reserve, Madagascar

Edwin Giesbers / Ring-tailed lemur (Lemur catta) portrait, Berenty Reserve, Madagascar, Madagascar

Edwin Giesbers / Ring-tailed lemur (Lemur catta) portrait, Berenty Reserve, Madagascar

Inaki Relanzon / Ring-tailed lemur (Lemur catta) group sitting on ground, sunning in morning sun, Berenty private reserve, south Madagascar

Inaki Relanzon / Ring-tailed lemur (Lemur catta) looking down from large spiney plant, Itampolo, South Madagascar

Inaki Relanzon / Ring-tailed lemur (Lemur catta) feeding on fruit in tree, Berenty private reserve, south Madagascar

Kevin Schafer / Ring-tailed Lemur (Lemur catta) in Octopus tree, Mantady National Park, Madagascar

Jouan & Rius / Ring-tailed Lemur (Lemur catta) eating flower of E {Euphorbia sp}, dry forest of Berenty reserve, South Madagascar

Jouan & Rius / Hand of Ring-tailed Lemur (Lemur catta), dry forest of Berenty reserve, South Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) walking across rocks in the Andringitra Mountains, vulnerable, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) portrait on rocks in the Andringitra Mountains, vulnerable, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) portrait on rocks overlooking the Andringitra Mountains, vulnerable, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) portrait on rocks in the Andringitra Mountains, vulnerable, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) mother and young, vulnerable, near Andringitra Mountains, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) mother and young, vulnerable, near Andringitra Mountains, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) portrait, vulnerable, overlooking the Andringitra Mountains, south central Madagascar

Pete Oxford / Ring-tailed Lemur (Lemur catta) walking across open ground, vulnerable, Berenty Reserve, southern Madagascar

Pete Oxford / Ring-tailed lemur on forest floor {Lemur catta} Berenty Private Reserve Madagascar

Rod Williams / Ring-tailed lemur {Lemur catta} infant on adults back. Captive. Madagascar. Lemurs

John Waters / Ring-tailed lemur in tree {Lemur catta} Madagascar

Gerry Ellis / Ring-tailed Lemur (Lemur catta) portrait, Madagascar

Gerry Ellis / Ring-tailed Lemur (Lemur catta) group, Washington Park Zoo, Portland, Oregon, endemic to Madagascar

Gerry Ellis / Ring-tailed Lemur (Lemur catta) sitting on tree branch, Madagascar

Pete Oxford / Ring-tailed lemur {Lemur catta} feeding at cactus flower Madagascar, Berenty

Pete Oxford / Ring-tailed lemur with young. (Lemur catta) Madagascar Berenty private reserve

Pete Oxford / Ring tailed lemur with young.,Berenty PR, Madagascar

Pete Oxford / Ring tailed lemur. Madagascar, Berenty Private Reserve

Pete Oxford / Portrait of Ring tailed lemur (Lemur catta) Madagascar. Berenty Private Reserve.

Pete Oxford / Ring-tailed lemur male licking nose, Madagascar

Pete Oxford / Ring-tailed lemur with young, Berenty Reserve, Madagascar

Pete Oxford / Ring-tailed lemur carrying young, Berenty Reserve, Madagascar

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), three including mother and baby. Ecotourists watching and taking photographs in background. Anja Community Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) female with baby amongst Tomato crop, Anja Community Reserve. Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), two sitting on branch. Berenty Reserve, Madagascar.

Cyril Ruoso / Founder of Anja Community Reserve, Adrien Razafimandimby face to face with Ring-tailed lemur (Lemur catta) female with baby. Madagascar. 2018.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) sitting on branch. Berenty Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), portrait, sunbathing in early morning with arms outstretched. Anja Community Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), three sitting sunbathing in early morning. Anja Community Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), two juveniles playing on granite rock, on foggy morning. Anja Community Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) sunbathing on rock in early morning, granite mountain in background. Anja Community Reserve, Madagascar. 2018.

Cyril Ruoso / Women and children working on Bean harvest on Anja Community Reserve. Lemurs look for food in this cultivated area of the reserve. Madagascar.