that has been described as being between a snore and a sigh. It also makes a hissing noise that has been described as a "shisss". Distribution and habitat The grey-necked rockfowl is found in West Africa from southeast Nigeria to southwest Gabon. In Nigeria, it is only found in the nation's southeastern corner near the coast and the Cameroon border. The species is widespread in southwestern Cameroon, and this country is considered to be the species' stronghold. It is found throughout Equatorial Guinea and into southwestern Gabon. Additionally, the species resides in the southwestern forests of the island of Bioko in the Gulf of Guinea. There is only one record of this species from the Republic of the Congo, though it is suspected that the rockfowl may have an undiscovered population in this country. The grey-necked rockfowl's total range covers approximately . The grey-necked rockfowl prefers rugged terrain in these forests covered in large boulders, caves, and gorges. Additionally, it often found near inselbergs and a source of water, either a river or a forest pool. The understory of its forests has sparse undergrowth or open spaces but is covered in mosses, ferns, lianas, and epiphytes. In southwestern Bioko it is found in low forests that receive nearly of rain a year. Bioko's habitat also has dense undergrowth and vertical gorges near a caldera. The rockfowl's habitat is normally found between above sea level, though it is lower in elevation on Bioko. This species is non-migratory, and at one site in Cameroon the birds remained within of their nesting site throughout the year. It is capable of living near human activity, and one breeding site in Cameroon was located within of a maize plot. This and other recent observations suggest that the rockfowl has greater tolerance for degraded habitat than previously thought. Ecology and behavior This rockfowl usually lives either alone or in pairs, although small flocks of three to ten birds are not uncommon. It normally moves through its habitat in a series of runs and long, springing hops on the ground and in low branches. It uses its tail for balance while hopping and running. When in a flock, rockfowl hop almost in unison. In the unusual occurrences when the species does fly, it is fast and is capable of navigating through the trees and rocks well. When it is standing still, the rockfowl has its tail down