Cattle Egret, Bubulcus ibis, perched on the back of a Blue Wildebeest, Connochaetes taurinus, in Telperion Nature Reserve, South Africa. Cattle Egrets remove and consume ticks and flies from large game and cattle; they also catch insects and small vertebrates disturbed by these animals when foraging and travelling. Photograph reproduced by permission of Emmanuel Do Linh San.