Sri Lanka is definitely one of the best places in the world to witness the social dynamics of diurnal primates. Noticeably, it has three species of diurnal primates (two are endemic) and two species of nocturnal primates (two lorises with one endemic).

Sri Lanka has three species of diurnal primates (two are endemic) and two species of nocturnal primates (two lorises with one endemic). It is probably one of the best places in the world to observe the social dynamics of diurnal primates. The endemic Toque Monkeys have been studied in one of the longest running field studies in the world.