December 14·Every year

World Monkey Day

World Monkey Day was created by art students Casey Sorrow and Eric Millikin in 2000 on a whim — Millikin wrote it on a friend's calendar as a joke. It spread online and has since become a genuine awareness day for primates and their habitats. Half of the world's 500 primate species are threatened with extinction, and deforestation is the leading cause.