Wikipeda: Squirrel Monkey (New Window)
Charts of squirrel monkey scientific classification and sub-species info. There is also general information about squirrel monkeys.
Squirrel Monkey (New Window)
Site starts out with a lot of nice pictures of squirrel monkeys and then presents several paragraphs of interesting information about squirrel monkeys as well.
Primate Info Net: Squirrel Monkey (New Window)
A nice site by the National Primate Research Center, University of Wisconsin. This site contains a short list of facts at a glance (with a converter to switch between metric and English measurements) as well as a lot of information about the squirrel monkey.