Semnopithecus entellus, commonly known as the Indian langur or hanuman langur, is a medium-sized primate native to the Indian subcontinent. Characterized by its long limbs, distinctive black face, and long tail, this species typically has a coat that ranges from gray to brown, with lighter underparts. Adult males weigh between 15 to 25 kilograms (33 to 55 pounds), while females are slightly smaller.

Found in a variety of habitats, including forests, grasslands, and urban areas, Indian langurs are highly adaptable and often live in large, social groups led by a dominant male. Their diet primarily consists of leaves, fruits, flowers, and seeds, making them primarily folivorous. They are known for their strong social bonds, often grooming each other and engaging in playful behaviors.

Indian langurs are diurnal, spending their days foraging and resting in trees. Their vocalizations, including distinctive calls, play a crucial role in communication within the group. While not currently endangered, habitat loss and human encroachment pose threats to their populations. The Indian langur is important in maintaining the ecological balance by dispersing seeds and contributing to forest health, highlighting its role in the ecosystem.