Probably my favorite monkey, the pygmy marmoset is the smallest known monkey in the world. Although adorable, please do not keep these as pets. Keeping a primate as a pet endangers your and their health since we can transmit diseases to one another. But at least we can gawk at their cuteness!
Photo By: http://fabulousmaguk.files.wordpress.com/2012/07/pa-44261413.jpg