Identified as a distinct species only in 2006, this lemur remains elusive to science. It's exact numbers and range are as yet unknown, though it is thought to live only on northwestern Madagascar's Sahamalaza Peninsula.
Active by night, the medium-sized lemur has been spotted nesting in trees by day, which may make it especially easy prey for human hunters. Other threats include forest clearing for farming as well as logging for charcoal and building materials.
The species was named one of the 25 most endangered primates in the October 27, 2007, report by the Primate Specialist Group of the World Conservation Union's Species Survival Commission and the International Primatological Society, in collaboration with Conservation International.