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| Subspecies: | Unknown |
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| Est. World Population: | |
| CITES Status: | NOT LISTED |
| IUCN Status: | Vulnerable |
| U.S. ESA Status: | NOT LISTED |
| Body Length: | |
| Tail Length: | |
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| Weight: | |
| Top Speed: | |
| Jumping Ability: | (Horizontal) |
| Life Span: | in the Wild |
| Life Span: | in Captivity |
| Sexual Maturity: | (Females) |
| Sexual Maturity: | (Males) |
| Litter Size: | |
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This nocturnal and arboreal species occurs in tropical moist lowland and montane forests, as well as secondary forest formations. They are most active soon after dusk and before dawn. The diet is almost exclusively folivorous consisting mainly of mature and immature leaves and buds supplemented with flowers, bark, and seldomly fruit. During the day, they typically sleep in clumps of dense foliage, sometimes fairly close to the ground, where group members huddle together. Groups of up to five have been reported, and home ranges of 1–2 ha are aggressively defended. Small group size indicates monogamous groupings, but longitudinal and genetic data are needed to better understand this social behaviour. Single births take place in August and September (Ganzhorn et al. 1985, Ganzhorn 1988, Mittermeier et al. 2010).
This species is found in north-eastern Madagascar. It has long been confirmed as far north as Marojejy National Park (Sterling and McFadden 2000) and recent surveys have confirmed its continued presence in Marojejy (Loudon et al. 2017). It may also be found further north in fragments as far as the Bemarivo River (Mittermeier et al. 2010). The southern limit includes Mantadia National Park and Analamazaotra Special Reserve (Ganzhorn 1988) in addition to forest fragments further south until the Nesivolo/Mangoro rivers (Mittermeier et al. 2010).
This species is likely affected by national trends in forest habitat loss: Madagascar lost 37% of its forest cover from 1973 to 2014, with an annual deforestation rate of 1.1%/year from 2010 to 2014. Almost half of Madagascar's forest (46%) is now located within less than 100 metres from the forest edge (Vieilledent et al. 2018).
This species is listed on Appendix I of CITES. As per Rylands et al. (2018), the species occurs in the following protected areas: Parc National de Marojejy; COMATSA Sud; Reserve Speciale d'Anjanaharibe-Sud; Parc Naturel de Makira; Parc National de Mananara-Nord; Reserve Speciale de Marotandrano; Reserve Speciale d'Ambatovaky; Reserve Speciale de Pointe a Larree; Tampolo; Parc National de Zahamena; Reserve Speciale d'Analalava; Ankeniheny-Zahamena; Reserve Naturelle Integrale de Betampona; Sahafina; Parc National de Mantadia; Torotorofotsy; Parc National d'Analamazoatra; Reserve de Ressources Naturelles de Maromizaha; Reserve de Ressources Naturelles de Mangabe-Ranomena-Sahasarotra; Reserve Speciale d'Ambohitantely; Anjozorobe-Angavo; and Parc National de Marolambo.