This skull is 1:1 scale.

Length: 7 cm / 2.75 in
Height: 4.7 cm / 1.85 in
Depth: 4.4 cm / 1.73 in

Common squirrel monkey is the traditional common name for several small squirrel monkey species native to the tropical areas of South America. The term common squirrel monkey had been used as the common name for Saimiri sciureus before genetic research by Jessica Lynch Alfaro and others indicated S. scuireus covered at least 3 and possibly 4 species: the Guianan squirrel monkey (S. scuireus), Humboldt’s squirrel monkey (S. cassiquiarensis) and Collins’ squirrel monkey (S. collinsi). The Ecuadorian squirrel monkey (S. cassiquiarensis macrodon), generally regarded as a subspecies of Humboldt’s squirrel monkey, had also been sometimes proposed as a separate species that had originally been included within the term “common squirrel monkey.”