Zoo conservation researcher Chloe Inskip counts Ring-Tailed Lemurs as part of Chester Zoo's annual stock take in Chester , northern England, January 8, 2008. The Zoo, which has over 8,000 individual animals, has to undertake the task every year as part of it's licence requirements. REUTERS/Phil Noble (BRITAIN) 

A Black and White Ruffed Lemur clings to a branch at the Monkeyland Primate Sanctuary near Pletteberg Bay on South Africa's scenic Garden Route September 30, 2007. Common to Madagascar, the Black and White Ruffed Lemur is currently classified as Endangered by the World Conservation Union. World Animal Day is commemorated on October 4. REUTERS/Mike Hutchings (SOUTH AFRICA) 

A young Ring-tailed lemur clings to its mother at the Monkeyland Primate Sanctuary near Pletteberg Bay on South Africa's scenic Garden Route, September 30, 2007. Common to Madagascar, the Ring-tailed lemur is considered vulnerable to extinction by conservationists. World Animal Day is commemorated on October 4. REUTERS/Mike Hutchings (SOUTH AFRICA) 

A group of Ring-tailed lemurs clamber along a branch at the Monkeyland Primate Sanctuary near Pletteberg Bay on South Africa's scenic Garden Route September 30, 2007. Common to Madagascar, the Ring-tailed lemur is considered vulnerable to extinction by conservationists. World Animal Day is commemorated on October 4. REUTERS/Mike Hutchings (SOUTH AFRICA) 

Lemurs are seen during the first ever nightly guided tour at Buenos Aires' Zoo August 22, 2007. REUTERS/Marcos Brindicci (ARGENTINA) 

A zookeeper feeds a Lemur fresh fruit inside its case at Madrid's zoo August 8, 2007. REUTERS/Sergio Perez (SPAIN) 

A baby maki (L), born a week ago, is seen with its mother at Saint Jean Cap ferrat zoo, south-eastern France April 6, 2006. REUTERS/Eric Gaillard 

A brown lemur is seen in 'Senda El Retiro' botanical park in Malaga, southern Spain, February 22, 2006. Senda del Retiro is the biggest botanical park in Spain and is a combination of flora, water and exotic species in a unique environment where it enjoy one of a biggest birds collection of the world which live amidst a lush vegetation. REUTERS/Rafael Marchante PP06020241 

A brown lemur baby sticks out his tongue while carried by his mother at the 'Serengeti' Safari park in the northern German village of Hodenhagen June 16, 2004. The thirty-year old private safari park has welcomed 11 newborn monkey babies from four different species over the past six weeks. REUTERS/Christian Charisius CHA/AKW/JV