Photo by joelsartore | Meet Bin, an endangered northern yellow-cheeked gibbon, photographed eprc.vietnam. Gibbons like Bin are exclusively arboreal, meaning they spend almost all their time in trees, trying to avoid touching their feet to the ground. While this might seem impossible, it's actually quite easy for gibbons thanks to their extra-long arms. This species uses those lanky forelimbs for brachiation—a form of movement in which primates swing from tree limb to tree limb using only their arms. To see more species featured in the Photo Ark follow me joelsartore. #gibbon #primate #animal #mammal #cheeks #photography #animalphotography #wildlifephotography #studioportrait #PhotoArk