As one of the most vocal primates, the Ring-tailed Lemur utilizes numerous vocalizations including group cohesion and alarm calls. Experiments have shown that the Ring-tailed Lemur, despite the lack of a large brain (relative to simiiform primates), can organize sequences, understand basic arithmetic operations and preferentially select tools based on functional qualities.
Despite being listed as Near Threatened by the IUCN Red List and suffering from habitat destruction, the Ring-tailed Lemur reproduces readily in captivity and is the most populous lemur in zoos worldwide, numbering more than 2000 individuals. It typically lives 16 to 19 years in the wild and 27 years in captivity.
Information from: http://www.bbc.co.uk/nature/life/Ring-tailed_Lemur