Yellow-billed Oxpecker (Buphagus africanus)
My two Brit birding companions for the 14th - 16th saw plenty of Oxpeckers their last trip to The Gambia -- but the birds were mostly in palm trees. Steve in particular was happy the oxpeckers this time around were behaving properly and showing good form.
Roughly near Tendaba, The Gambia. Geotagged.