It is celebrated internationally on December 14th. It is mainly about monkeys, but it celebrates other non-human primates such as apes, tarsiers, and lemurs. It is also an unofficial holiday.
You can read more about Monkey Day by going here.
Have you ever heard of Monkey Day? Do you celebrate Monkey Day? Are you a fan of monkey's, apes, tarsiers, and lemurs?
I know I for one, think monkey's are cute. I have never heard of monkey day, until today, so I don't celebrate it.