This gallery contains 3 photos. The profile pose of this Goeldi’s Marmoset is a dignified one. If a bit pensive/punchy, depending on your interpretation.
This was taken at the other end of the enclosure, where 4 more marmosets also live. The supplicant on the right may in fact be the child of the marmoset Ginger (on the left), and she is asking to be groomed. Photographed at the Vancouver Aquarium on July 6.
As per their Wikipedia profile, Goeldi’s marmosets are classified as Vulnerable, and their range is (quite) limited to the Upper Amazon basin.