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.

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 / 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.

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

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

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

Nick Garbutt / RF- Young Ring-tailed lemurs (Lemur catta) carried on mother's back, Madagascar. (This image may be licensed either as rights managed or royalty free.)

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

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

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.

Fiona Rogers / Ring-tailed Lemur (Lemur catta) female carrying baby one her back, sitting and alert. 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) infant (less than 1 month) chasing tail of adult lemur. Berenty Private Reserve, Madagascar. Oct 2008.

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

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

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

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

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) feeding on fruit in tree, Berenty private reserve, south Madagascar

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

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

Nick Garbutt / RF- Ring tailed lemur carrying young (Lemur catta). Madagascar. (This image may be licensed either as rights managed or royalty free.)

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

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

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