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Motacilla capensis
The Cape Wagtail is a slender bird, 19–20 cm in length, with the characteristic longish, constantly wagging tail of its genus. The adult is plain grey-brown above, apart from pale wing edges and a short white supercilium. It has off-white underparts, with a dark grey band across the breast. Young birds are duller and have yellowish underparts. Cape Wagtail has a tsee chee chee call and a trilled whistled song.
This is an insectivorous bird of open country, often near habitation and water. It prefers bare areas or short grass for feeding, where it can see and pursue its prey.
With the large amount of white on the wings and tail, I'd say it has to be an African Pied Wagtail instead of a Blue-headed.