Abstract: In this study, satellite collar tracking was employed to locate and monitor twoNycticebus bengalensisindividuals in the Mangxinghe area （Dehong Prefecture）, and the Nangunhe Nature Reserve （Lincang Prefecture）, Yunnan Province, aiming to analyze the diurnal and nocturnal differences in their habitat use and the underlying influencing factors. The results showed that slope aspect and canopy height were the key habitat factors driving habitat utilization and exhibiting significant diurnal and nocturnal differences. Diurnally,N. bengalensistended to utilize closed evergreen broadleaved forests, needleleaved forests, and shrublands with south-facing aspects, moderate slopes （10°－30°）, and canopy heights of 5－20 m. Nocturnally, the species showed a strong preference for closed evergreen broadleaved forests with a southeastern aspect, moderate slopes （10°－30°）, and canopy heights of 10－20 m. These differences might reflect an adaptive strategy to cope with pronounced diurnal temperature fluctuations, foraging requirements, and predation risks in this edge-of-plateau region. During the day, such behavior facilitated passive heat absorption to reduce the energy costs of thermoregulation, aligning with the energy-saving strategy observed in small mammals in plateau environments. During the night, this selection relied on dense upper canopy cover to avoid predators and improve foraging efficiency, while the heat-retaining characteristics of southeast-facing slopes helped alleviate low-temperature stress. This study was the first to apply satellite collar technology to achieve precise tracking of wildN. bengalensis, filling a critical data gap regarding the diurnal and nocturnal habitat use characteristics of this species in edge-of-plateau regions. The results not only provided a scientific basis for the targeted conservation and habitat restoration ofN. bengalensis, but also revealed habitat use patterns that provide important behavioral insights for future research into the mechanisms of plateau environmental adaptation in nocturnal primates.

Key words: Nycticebus bengalensis, satellite collar tracking, habitat utilization, diurnal-nocturnal differences, behavioral adaptation