Unusual nest of Black-throated Diver.--The photographs reproduced on plate 40 show an unusual nest of the Black-throated Diver (Gavia arctica) which I found in June 1954 in central Sweden. This was built up on small rocks in the centre of a large lake where the water was shallow enough for a few reeds and two stunted trees to grow. The Handbook quotes a record of an abnormal nest among willow bran...

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