Only the Malabar Civet is generally nocturnal, being more active after sunset. The Lion-tailed Macaque, primarily a diurnal species, is active during the daytime, foraging and socializing. Similarly, the Sambar Deer is also diurnal, with most activities such as feeding occurring in daylight. Understanding the activity patterns of these species is crucial in the context of ecology and animal behavior studies, as outlined in standard UPSC-level sources like NCERT texts, which emphasize the adaptations of species to their environments and the implications for biodiversity conservation.