Pygmy Marmoset, Peru I had mentioned in a previous post that pygmy marmosets are only five inches in length, not including the tail. Here you can see the additional eight inches of tail. This guy was out doing what they do — gnawing holes in trees to eat the resultant tree gum. They also eat nectar and fruit, and insects that are attracted to the sap holes they produce. Photographed in the northern Amazon basin of Peru. Nikon D500 with Nikkor 500mm PF lens, ISO 800, f/5.6 at 1/125th of a second, Godox V860iii fill flash.