This video from the Netherlands says about itself:
10 January 2016
Great Northern Loon (Gavia immer) in the urban waters of Binckhorst (Den Haag, Netherlands). The bird showed beautifully from close by, up to 2 meters, and was foraging on exotic [originally, North American] crayfish (as seen in this movie). The bird sometimes stayed under water for up to a minute.
Photos of this The Hague loon are here.
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