We collected the data of the activity budget and diet for a group of Tufted grey langurs Semnopithecus priam priam (TGL) in Pothigaiadi rural village from 2019 to 2020. This population is unstudied, and is near the eastern boundary of the species range adjacent to the Kalakad-Mundanthuarai Tiger Reserve (KMTR). We calculated the seasonal activity budget and diet composition by scan sampling from 96 full-day observations (dry season: 32, southwest monsoon: 32, and northeast monsoon: 32 days). During scan sampling, we recorded behavioural activities, and the food items and species consumed. TGL consumed 95 species of food plant, including trees and shrubs of 29 families. The food species varied seasonally. The annual activity budget of TGL is 31.88% social interaction, 23.57% resting, 23.27% feeding, 13.84% locomotion, 5.65% other activities, and 1.80% conflict. The overall diet of TGL consisted of 62.90% leaves, 7.81% mature fruits, 6.18% flowers, 5.85% tender leaves, 4.89% young fruits, 4.04% bark, 3.89% mud, 3.59% insects, and 0.85% water. The seasonal activity budget and diet composition of the TGL is discussed.

我们收集了一组簇绒灰叶猴Semnopithecus priam priam的活动预算和饮食数据(TGL) 于 2019 年至 2020 年在 Pothigaiadi 乡村。该种群未经研究，靠近 Kalakad-Mundanthuarai 老虎保护区 (KMTR) 附近物种范围的东部边界。我们通过对 96 个全天观测数据（旱季：32 天，西南季风：32 天，东北季风：32 天）的扫描采样计算了季节性活动预算和饮食构成。在扫描采样期间，我们记录了行为活动以及消耗的食物和物种。TGL消耗了95种食用植物，包括29科的乔木和灌木。食物种类随季节变化。TGL 的年度活动预算为 31.88% 的社交互动、23.57% 的休息、23.27% 的进食、13.84% 的运动、5.65% 的其他活动和 1.80% 的冲突。TGL 的整体饮食包括 62.90% 的叶子、7.81% 的成熟果实、6.18% 的花、5. 85% 嫩叶、4.89% 幼果、4.04% 树皮、3.89% 泥、3.59% 昆虫和 0.85% 水。讨论了 TGL 的季节性活动预算和饮食构成。