The bamboo or gentle lemurs are the lemurs in genus Hapalemur.
These medium-sized primates live exclusively on Madagascar.
Bamboo lemurs were first described by French zoologist Isidore Geoffroy Saint-Hilaire in 1851.
Comparing their small size, proportions, speckled fur, and other traits to those of marmosets—then classified in the genus Hapale—he named the genus Hapalemur.
Hapale derives from the Greek word hapalos, meaning "gentle".
Reference: Wikipedia