Marmoset monkeys for sale. Often called the finger monkey, these tiny monkeys grow the size of a barbie doll and weigh less than a pound as adults. Don’t let their adorable size and facial expressions fool you, they are very curious and highly intelligent. Because they are new world primates, they are the most difficult click here animals we raise, they require the most dedication and time, all the time. If you are seriously interested in obtaining a marmoset monkey, please contact us now. High Quality Males and Females Available For Breeding And For Great Companions. You can expect a healthy marmoset monkey in captivity to live 15 to 20 years. Some people call them finger monkeys, this is not a scientific term, but more of a social term of endearment because of their size at birth