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Ak sungur (Falco rusticolus) is a member of the falcon family (Falconidae) and the largest species in the Falco genus. Taxonomy and Systematic Position Ak sungur (Falco rusticolus) is a member of the falcon family (Falconidae) and the largest species in the Falco genus. The scientific name of the species was described by Carl Linnaeus in 1758. In English it is known as the Gyrfalcon. Within the taxonomy of Falco rusticolus, three color morphs have been identified: white, gray, and dark. Genetic