Butler, H., & 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), 196-204. https://doi.org/10.4102/satnt.v26i3.133