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♦ 1Black Harrier Circus maurus of the Fynbos biome, South Africa: a threatened specialist or an adaptable survivor?, ODETTE CURTIS, ROBERT E. SIMMONS and ANDREW R. JENKINS, Bird Conservation International (2004) 14:233–245
♦ 2The diet of the Lanner (Falco biarmicus) in a hyper-arid region of the eastern Sahara, Goodman S. M., Haynes C. V., Journal of arid environments, 1992, vol. 22, no1, pp. 93-98