Habitat Characteristics and Their Effects on the Density of Groups of Western Hoolock Gibbon (Hoolock hoolock) in Namdapha National Park, Arunachal Pradesh, India - Parimal Chandra Ray; Awadhesh Kumar; Ashalata Devi; Murali C. Krishna; M. L. Khan; W. Y. Brockelman (International Journal of Primatology, 2015)