Saimiri cassiquiarensis (Humboldt’s squirrel monkey) occurs in the western and northern Amazon Basin of Brazil, Colombia, Ecuador, Peru, and Venezuela. It is a small, slender primate with a pale facial mask, dark muzzle, short dense coat, and a long nonprehensile tail used for balance. The tail does not grasp branches like that of many New World monkeys.

Squirrel monkeys live in large, fluid troops that can contain dozens of individuals. They travel quickly through the lower and middle canopy, using narrow supports and frequent leaps while searching for insects, spiders, fruit, flowers, and other food. The proportion of animal and plant material changes seasonally as fruit and arthropod availability shifts. Close physical contact, grooming, vocal calls, scent marking, and visual signals help maintain social relationships within a moving group. Photographed in Ecuador where they for opportunties to take your food at outdoor restaurants.