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Butler, H. and Kok, O. 2007. Habitat preference, feeding distance and flight direction of cattle egrets (Bubulcus ibis) in the central Free State. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;. 26, 3 (Sep. 2007), 196-204. DOI:https://doi.org/10.4102/satnt.v26i3.133.