Sandesh Kadur / Northern pig-tailed macaque (Macaca leonina) sitting on a tree branch. Hoollongapar Gibbon Sanctuary, India. March.

Thomas Marent / Hoolock Gibbon (Hylobates hoolock) in tree, Hoollongapar Gibbon Sanctuary, Assam, India

Thomas Marent / Hoolock Gibbon (Hylobates hoolock) hanging in tree, Hoollongapar Gibbon Sanctuary, Assam, India