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2. Measuring Behaviour, an introductory guide;Bateson,1990
3. Species Action Plan for the Egyptian vulture Neophron percnopterus in the European Union;BirdLife International,2008
4. The breedings status and colony dynamics of Cape Vulture Gyps coprotheres in Botswana;Borello;Bird Conservation International,2002
5. Ecology of Vulture of different species and an around Jodhpur (Rajasthan), India;Chhangani;Tiger Paper,2002