Long waging tail and yellow colouring feeding by waters edge in Cheddar Gorge.See below, orginally mistaked for Yellow wagtail
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The bright yellow colouring on the underparts is distinctive on this wagtail, but there is another species with yellow underparts that is more frequently found on rivers and streams (especially fast flowing ones) - Yellow Wagtails are more typically found in wet pasture and marshy areas.
The upperpart colouration, and the yellow rump, are the key to the identification of this one.
Lat/Lng: 51.280281852543, -2.7720689176203
OS grid ref: ST462537