(brown-headed parrot) gram (≈ 0,18 to 0,21 oz). The chicks are covered in white or light grey downy feathers and their usually rather noisy parents become more quiet and watchful while around the nest. How long the non-captive hatchlings stay in the nest is poorly known, more precise observations of wild specimens are only available for Cape parrots and brown-necked parrots. Young Cape parrots remain in the nesting cavity for up to 79 days, while the brown-necked parrot chicks leave their home on the 69th day. Reliable data concerning Senegal and brown-headed parrots bear on the observation of captive parrots which revealed that the fledgling period of Senegal parrots varied between nine and eleven weeks while young brown-headed parrots left the nest during the twelfth week of their lives. The male kept feeding them until they were fifteen weeks old. Predators, parasites, and typical illnesses Sitting females and nestlings are especially vulnerable to predation, e.g. by dasypeltes, boomslangs, monitor lizards like savannah and Nile monitors, baboons, civets, and mongooses. The African harrier-hawk likewise sometimes robs the nests, holding on to the entrance of the cavity with one claw and grabbing the nestlings with the other. The mentioned predators mostly capture eggs and fledgling birds, while adult birds may be hunted by eagles, hawks, falcons, and sparrowhawks of appropriate size. The most common ectoparasites found on Poicephalus parrots are feather mites and bird lice that live on the birds' feathers and skin. Like other wild animals, Poicephalus parrots may be infested with internal parasites like Coccidia, Ascaridida, Capillaria nematodes, and Cestoda (tapeworms). Little is known about diseases typical of wild Poicephalus parrots but the examination of Cape parrots and Rüppell's parrots found that parts of these populations are infected with the virus that causes the Psittacine beak and feather disease (PBFD). There is still no treatment available for this often fatal disease and although some birds may show no symptoms, they may nonetheless spread the virus they carry. Population The population dynamics and conservation status of the various Poicephalus species are heterogeneous, ranging from "least concern" to "endangered". More extensive field studies have been undertaken only in South Africa and Namibia so far, hence the most reliable data come from those regions and the species and subspecies living there. According to the World Parrot Trust online encyclopedia, the numbers of most Poicephalus species remain unknown but are assumed to be stable,