The relationship between cattle egrets and cape buffalo would not be commensalism if the egrets removed ticks from the buffalo, because both species would benefit. The buffalo would be tick free and the egrets would have food to eat.
No. The great white heron is actually a race of the great blue heron, found in the Florida Keys, Cuba, Yucatan. However, the slightly smaller great egret is found there, and is a large white heron as well. Egrets are herons.
In areas where both animals live, the egrets feed on insects that are attracted to the cattle. This is a symbiotic relationship because both parties benefit and neither is harmed - the cattle have fewer insects bothering them and the egrets have easily obtained meals.