Noisy Hoolock gibbons from Nagaland

From the archive record

Hoolock gibbons make noise as they interact with each other in the forest, Nagaland. Hoolocks are the second-largest of the gibbons, after the siamang. They reach a size of 60 to 90 cm and weigh 6 to 9 kg. The sexes are about the same size, but they differ considerably in coloration: males are black-colored with remarkable white brows, while females have a grey-brown fur, which is darker at the chest and neck. White rings around their eyes and mouths give their faces a mask-like appearance. The range of the hoolocks is the most northwestern of all the gibbons, extending from northeast India to Myanmar. Small populations (in each case few hundred animals) live also in eastern Bangladesh and in southwest China. In northeast India, the hoolock is found south of Brahmaputra and east of the Dib