Black-Throated Diver (Black-Throated Loon or Arctic Diver) (Gaviota arctica) showing its black throat clearly as it swims with its neck extended, Lochindorb, Scottish Highlands
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Black-Throated Diver (Black-Throated Loon or Arctic Diver) (Gaviota arctica) showing its black throat clearly as it swims with its neck extended, Lochindorb, Scottish Highlands
Close inspection reveals that the throat patch is in fact a deep purple, not black: Deep Purple-Throated Diver?