The Egyptian vulture (Neophron percnopterus), also called the white scavenger vulture or pharaoh's chicken.
The Egyptian vulture is usually seen singly or in pairs, soaring in thermals along with other scavengers and birds of prey, or perched on the ground or atop a building. On the ground, they walk with a waddling gait. They feed on a range of food, including mammal faeces (including those of humans), insects in dung, carrion, vegetable matter, and sometimes small animals. When it joins other vulture species at a dead animal, it tends to stay on the periphery and waits until the larger species leave.Wild rabbits (Oryctolagus cuniculus) form a significant part of the diet of Spanish vultures.Studies suggest that they feed on ungulate faeces to obtain carotenoid pigments responsible for their bright yellow and orange facial skin. The ability to assimilate carotenoid pigments may serve as a reliable signal of fitness.
Egyptian vultures are mostly silent but make high-pitched mewing or hissing notes at the nest and screeching noises when squabbling at a carcass. Young birds have been heard making a hissing croak in flight.They also hiss or growl when threatened or angry.
Egyptian vultures roost communally on large trees, buildings or on cliffs.Roost sites are usually chosen close to a dump site or other suitable foraging area. In Spain and Morocco,summer roosts are formed mainly by immature birds. The favourite roost trees tended to be large dead pines. The number of adults at the roost increases towards June. It is thought that breeding adults may be able to forage more efficiently by joining the roost and following others to the best feeding areas. Breeding birds that failed to raise young may also join the non-breeding birds at the roost during June.
This species faces a number of threats across its range. Disturbance, lead poisoning (from ammunition used in hunting game), direct and secondary poisoning, electrocution , collisions with wind turbines, reduced food availability and habitat change are currently impacting upon European populations with juveniles showing higher declines and mainland populations showing higher rates of juvenile mortality than island populations. Illegal poisoning against carnivores seems to be the main threat operating on the breeding grounds in Spain and the Balkans. Declines in parts of Africa are likely to have been driven by loss of wild ungulate populations and, in some areas, overgrazing by livestock and improvements in slaughterhouse sanitation. Within the European Union, regulations introduced in 2002, controlling the disposal of animal carcasses, greatly reduced food availability, notably through the closure of traditional "muladares" in Spain and Portugal. However, recently passed regulations will permit the operation of feeding stations for scavengers and guidelines about how to operate them exist, and in eastern Europe dietary diversity has no effect on population sizes, but instead could affect territory size. Poisoning is a threat to the species, often through the use of poison baits targeted at terrestrial predators, and through the consumption of poisoned animals. Recent analyses from many countries including Bulgaria have highlighted potential contamination of Egyptian Vultures that may lead to increased mortality. Antibiotic residues present in the carcasses of intensively-farmed livestock may increase the susceptibility of nestlings to disease (e.g. avian pox has been reported as a cause of mortality in Bulgaria ).
It appears that diclofenac, a non-steroidal anti-inflammatory drug (NSAID) often used for livestock, and which is fatal to Gyps spp. when ingested at livestock carcasses is driving the recent rapid declines in India. NSAIDs are reportedly toxic to raptors, storks, cranes and owls, suggesting that vultures of other genera could be susceptible to its effects. It seems plausible that this species previously had less exposure to the toxin owing to competitive exclusion from carcasses by Gyps spp. vultures In 2007, diclofenac was found to be on sale at a veterinary practice in Tanzania. In addition, it was reported that in Tanzania, a Brazilian manufacturer has been aggressively marketing the drug for veterinary purposes and exporting it to 15 African countries. This drug has recently been approved for veterinary use in Europe, and is commercially available in France and Spain, which is a major concern for the species.
Mortality at power lines has been found to be particularly common on the Canary Islands and potentially risky in other regions of Spain and in Africa, with 17 individuals found killed by electrocution in Port Sudan, over 10 days in 2010, indicating a potentially serious problem that has persisted for decades and will continue to contribute to Egyptian Vulture population declines. In Morocco at least, the species is taken for use in traditional medicine, and it (like all African vultures) may have local commercial value as a traditional medicine throughout Africa. Competition for suitable nest sites with Griffon Vulture (Gyps fulvus) may reduce breeding success in the short-term.