Wall-nesting Kittiwakes
The birds are Kittiwakes, also known as three-toed gulls (Rissa tridactyla). Unlike other gulls, they breed on steep cliffs and have black wing tips, legs and feet. And, they are particularly loud and screechy. As seen on cliffs near Gunnuhver, Reykjanes Peninsula, Iceland.
This image is from the presentation "A Tour of Elemental Iceland - Gunnuhver, Krysuvik, and Reykjavik".

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