There are lots of interesting facts about the white-faced capuchin, which is also known as the white-headed or white-throated capuchin (Cebus capucinus).
The white-faced capuchin is native to the forests of Central America. Although a fully-grown one weighs less than ten pounds, it can live for over fifty years.
Cebus capucinus is one of the most intelligent New World monkeys, and in the top ten list of the most intelligent primates worldwide. It's clever enough to use tools, and has been seen using sticks to defend itself and its infants from snakes.
The white-faced capuchin displays some behaviour that we can't fully explain yet. It rubs fruit and other plants into its fur, and sometimes washes its feet with urine (which I wouldn't recommend!).
On a personal note, my favourite member of this species is Marcel, who was Ross's pet monkey in early episodes of the sitcom Friends. Marcel was played by a monkey called Betsy, who (according to IMDB) also starred in the Nineties movie Outbreak.