Presbytes Entellus, commonly known as the Hanuman Langur or Gray Langur, is a species of Old World Monkey found across South Asia. There are various synonyms for this species, including Semnopithecus entellus, Entellus langur, and Southern Plains Gray Langur. These langurs are highly social and live in large troops led by dominant males. They are known for their gray fur, black face, and distinctively long tail. The Hanuman Langur is an important symbol in many Hindu cultures and is protected under Indian wildlife laws. Although they are known for raiding crops and some consider them pests, their impact on ecosystems and cultural significance make them an important species to protect.