Titi monkeys and their intertwine tails

            Titi monkeys         (C)Imgur

Titi monkeys are a monogamous species that presumably mate for life and live in groups of two to seven individuals consisting of a pair of adults and their offspring
Adult monogamous pairs are very close emotionally to one another, coordinating their activities to a high degree and remaining within close proximity. In addition to coordination of activities, the pair will frequently huddle, intertwine tails, groom and hold hands.
Another picture after the cut

                  Titi monkeys enjoying their time on the three      (C)SeanFlannery

How many Titi monkeys are in the picture above?