Lutungs are herbivorous monkeys from the jungles of India and southeast Asia. They are slender with long tails. Their diet consists of leaves, fruit, and buds. Lutungs spend most of their time in trees.
Lutung social groups consist of a single adult male and his harem. Males without a harem gather in bachelor groups. When a harem is laken over by another male, he usually kills the suckling young to bring the females back into estrous and sire his own children. Lutung groups are territorial, and defend their territory from other groups - starting with shouts and screams, but escalating to violence if vocal persuasion does not work.