I place this video together because I used to find it hard to identify a gadwall amongst a flight of female mallards. Both the male and female gadwall have a white patch at the base of the hind wing. The female mallard has a blue patch in the same place. This is the simplest way to tell them apart particularly at a distance. Video was taken at Slimbridge WWT in March 2008. Edited in IMovie HD 6.0.4. Filmed on handheld Canon MV880X.

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