Thiollay (1995, 1996a) found Wallace's Hawk-eagle Spizaetus nanus in Rimbo Panti Nature Reserve (not in Gunung Singgalang area), and Sunda Wrinkled Hornbil Aceros corrugatus. This area is one of five locations for Sumatran Ground-cuckoo Carpococyx viridis. There is no record of this species in this area since 1916. This bird is one of the globally threatened and restricted-range species (Collar & Long 1996, Stattersfield et.al. 1998, BirdLife International 2000)
BirdLife International (2018) Important Bird Areas factsheet: Gunung Singgalang. Downloaded from http://www.birdlife.org on 15/10/2018.