One on the right faces to the right while scratching then the one on the left turns around to look, Dusky Leaf Monkey Trachypithecus obscurus, Thailand

trachypithecus obscurus dusky leaf monkey spectacled leaf monkey trachypithecus langur lutung primates spectacled langur simiiformes monkeys wildlife sanctuary mammals primate cercopithecidae habitat malaysia long tail foraging fruiting tree apes wildlife kaeng krachan arboreal animals branches mammalia canopy myanmar climbing habitat loss rainforest mongkeys jungle thailand endangered trees endangered species haplorhini nature forest leaves folivorous national parks natural morning green howling