sites. It is known to regurgitate what it has eaten in pellet form. Overall, between 52 and 60 percent of the bird's diet is believed to be composed of animals. Rove beetle larvae and ants were the most frequently eaten prey in a study in Nigeria. Reproduction The grey-necked rockfowl breeds either alone or in small colonies averaging two to five nests in size, though nearly fifty nests are present at one site. It is monogamous and therefore does not breed with rockfowl other than its mate. It is believed to breed cooperatively in Equatorial Guinea, as four different birds were observed feeding one nest. The rockfowl's courtship displays are unknown. The timing of the egg laying in a colony is not synchronized, leading to various stages of development of nestlings within the colony. It has been suggested that this is to promote cooperative breeding. The laying dates also vary by region, typically coinciding with a few weeks before the onset of the wet season; in areas where the wet season is bimodal, two different breeding seasons occur. However, in mountainous regions such as Mount Cameroon, it breeds during the dry season to avoid the frequent mists of the wet season. Birds in Nigeria lay their eggs between August and November, birds in Gabon lay between November and April, birds in western Cameroon lay between March and November with peaks of June, July, and October, and birds in southern Cameroon have two breeding seasons, a main one from October to December and a secondary one lasting from April to May. In Equatorial Guinea, nesting occurs in mid-February. This rockfowl builds its nest onto the sides of rocks, normally in caves, where nests are built both by the entrance and deep within, or on nearly vertical cliff faces, which can be either bare or have some vegetation, though never woody branches, near the nest. Nests need to be built under an overhang to protect it from water, and the rock surface normally slopes forward slightly. The nests are almost always found near water, which can be in the form of either streams or forest pools. These streams, particularly those located at the base of a nesting cliff, help keep predators away from the nests. Nests on rock surfaces are normally built above the ground. In addition to the rock face nests, there is a record of a nest being constructed on