Calumma vencesi

This species has a restricted range in the northeast of Madagascar where it has been collected from three forests, Betaolana, Besariaka and Tsararano, to the northwest of the Andapa basin (Andreone et al. 2001). It has been recorded between 700 and 960 m elevation, but probably occurs between 600 and 1,000 m (Andreone et al. 2001).  It has not been recorded from Masoala (F. Andreone pers. comm. January 2011). The chameleon's estimated extent of occurrence is 591 km².

This chameleonis thought to be locally abundant, with one report of 10 individuals found per four hours of search effort (Andreone et al. 2001). Its intolerance of habitat degradation in an area of Madagascar where forests are subjected to heavy human use suggests the population is likely to be declining.

This species is believed to be restricted to intact lowland humid forest. It uses the understorey, 10-90 cm above the ground, for night roosts (Andreone et al. 2001). Its absence from degraded forest areas indicates that it is intolerant of habitat modification (Andreone et al. 2001)

Habitat loss and degradation due to slash-and-burn agriculture and logging (especially of rosewood) represent threats to this chameleon, which requires intact forest for its persistence.