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Figure 1. Variation in mean monthly nocturnal and diurnal activity (± SE) in E. mongoz at Anjamena, northwest Madagascar (16°03'S; 45°55'E) during a 10-month field study in 1994-1995 (Curtis et al., 1999) and annual changes in the light/dark ratio (Thomas and Curtis, 2001). Nocturnal activity is maximal and diurnal activity minimal around the austral winter solstice (AWS) when daylength is shortest. The austral autumnal equinox (AAE) occurs just prior to the shift from predominantly diurnal activity to predominantly nocturnal activity and the austral spring equinox (ASE) just before the shift back to mainly diurnal activity. The peak in nocturnal activity in November may be connected to predator avoidance, as this coincides with part of the raptors nesting period at Anjamena, low canopy cover, and the onset of infant mongoose lemurs' independent movements (Curtis et al., 1999).

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