@article{Butler_Kok_2008, title={Relationship between group size and feeding success of cattle egrets (Bubulcus ibis) in the central Free State}, volume={27}, url={http://www.satnt.ac.za/index.php/satnt/article/view/218}, DOI={10.4102/satnt.v27i3.92}, number={3}, journal={Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;}, author={Butler, Hennie and Kok, Ordino}, year={2008}, month={Sep.}, pages={216-227} }