Rüppell's Vulture (Gyps rueppellii) is a medium-sized vulture that occurs throughout the Sahel region of central Africa. The current population of 30,000 is in decline due to ongoing loss of habitat and other pressures. Rüppell's Vulture is considered to be the world's highest-flying bird, with confirmed evidence of a flight at an altitude of 11,000 metres (36,100 ft) above sea level. A Rüppell's Vulture was confirmed to have been ingested by a jet engine of an airplane flying over Abidjan, Côte d'Ivoire on November 29, 1973 at an altitude of 11,000 metres (36,100 ft). In August 2010 a Rüppell's Vulture escaped a bird of prey site in Scotland, prompting warnings to pilots in the area to keep an eye out due to the danger of collision.