Butler, Hennie, and Ordino Kok. “Relationship Between Group Size and Feeding Success 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; 27, no. 3 (September 16, 2008): 216-227. Accessed March 29, 2024. http://www.satnt.ac.za/index.php/satnt/article/view/218.