This little bird (often with other oxpeckers helping) eats the bugs that would otherwise be an annoyance to the many large animals on the Masai Mara. I saw them on water buffalo and giraffes throughout our time there. In this image you can see all the little insects it has to eat!
What a truly stunning photo of this incredible water buffalo! The "meal" he carries is a spread "fit for a king"...what a marvelous symbiotic relationship!