Hoolock gibbons are two primate species of genus Hoolock in the gibbon family, Hylobatidae.
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.
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