Adult, Animal, Asia, Cercopithecidae, Day, Dusky Leaf Langur, Dusky Leaf Monkey, Endangered, Endangered Species, Head and Shoulders, Horizontal, Khao Sam Roi Yot National Park, Langur, Mammal, Monkey, National Park, Nobody, Old World Monkey, One Animal, Outdoors, Portrait, Primate, Profile, Side View, Southeast Asia, Spectacled Langur, Thailand, Thailand National Park, Trachypithecus obscurus, Trachypithecus sp, Wildlife