A wattled starling (Creatophora cinerea) perches on the back of a wildebeest. Lacking the distinctive black and yellow markings on its face, this starling may be a non-breeding male or a female.
Starlings hope to score a meal when hanging with their big friends. Livestock movement can stir up insects or reveal ectoparasites (like ticks, mites, or fly larvae) on their tough hide.
Either way, this bird is hungry and ready to help.
It is a good example of mutualistic symbiosis. Or cast proverbially, why we work better in teams.