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The bamboo lemurs or gentle lemurs are the in genus Hapalemur. These medium-sized live exclusively on Madagascar.
In their discussion of lemur name etymologies, Dunkel et al. speculated that the once popular Common name for the genus, "gentle lemur", derived from the translation of Hapalemur, despite their notoriety for being one of the most aggressive lemurs in captivity—an observation first noted in a letter by Dutch naturalist François Pollen published in 1895. More recently, the common name "bamboo lemur" first appeared in the mid- to late-1980s following the rediscovery of the greater bamboo lemur ( Hapalemur simus). However, the name became more generally used a year or two later following the discovery of the golden bamboo lemur ( Hapalemur aureus) in 1987. For a few years, both names or combinations of both were widely used, but "bamboo lemur" became the preferred name in 1994 with the publication of the first edition of Lemurs of Madagascar. The term "gentle lemur" has seen little use in both popular and academic literature since the early 2000s.
Bamboo lemurs prefer damp forests where bamboo grows. Although they can be active any time of the day, they are often active just after dawn. Though primarily arboreal, they sometimes come down to the ground. The Lac Alaotra gentle lemur or "bandro" ( Hapalemur alaotrensis), which lives in the reed beds of Lac Alaotra, spends much of its time in water and can swim well, unlike other lemur species, which only venture to water to drink.
The lesser gentle lemurs live together in groups of three to five animals, which probably represent families composed of a male, one or two females, and their offspring. They communicate with a variety of sounds.
Gestation lasts 135 to 150 days and ends between September and January, when the female bears one to two young. These are weaned after about four months (if the food supply is ample) and are fully mature at two years of age. Their life expectancy is up to 12 years.
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