Primates include rhesus macaque and Hanuman langur. The rhesus macaque and the common langur are fairly common here. They are known for subsistence hunting of langur and macaque monkeys. The northern plains gray langur often associates with chital deer. It is also home to the striped hyena, macaques, langur and mongoose species. Species found here include the leopard, sambar, and the endemic purple-faced langur. The Nepal gray langur is both terrestrial and arboreal and eats leaves. The fruit is eaten by monkeys and birds, such as the gray langur. Bhutan has a rich primate life, with rare species such as the golden langur. The most common larger mammal is the endemic purple-faced langur. The classification of the Nilgiri langur has been disputed. Colobines are medium-sized primates with long tails (except for the pig-tailed langur) and diverse colorations. After killing the langur, the otters left the body floating in the pool. Both the black-footed gray langur and Kashmir gray langur are considered threatened. The northern plains gray langur eats primarily fruits and leaves.