The Yellow Wagtail (Motacilla flava) is a summer visitor, migrating to winter in Africa. A serious decline in breeding numbers means this species is now on the red list of birds of conservation concern. Occasional birds are seen as over-flys or on the ground at Erith Marshes (Crossness) and Crayford Marshes, but the sight of 5 on the deck at Danson on April 22nd was a great find for Donna Zimmer (who took all the photos below) and fellow birder Steve Carter.
The Yellow Wagtail should not be confused with the Grey Wagtail, which also has yellow on the underparts, but has a grey crown to the head, and grey upperparts.
On the same day Donna and Steve also reported 60 Swallow and 20 House Martin. These were joined by Swifts by 29th April.