This picture connects with the book Deja Dead through a monkey. One of the first victims was a monkey named ALSA from a college student's research project. Dr. Brennan thought that the killer used the monkey as practice for dismembering his future victims.
Finger monkeys are actually pygmy marmosets from the rain forest. These primates belong to the family Callitrichidae, species Cebuella and genus C. pygma. They are the tiniest living primates in the world. They are also known by the names "pocket monkeys" and "tiny lions". Theses adorable guys hug and grip on to your finger so tight that it pulls at your heartstrings and you want to take them home with you.