Bruine Kiekendief Circus aeruginosus met afwijkend verenkleed in de duinen bij Castricum
De takkeling , Volume 27 - Issue 1 p. 74- 76
On August 26, 2018, a young Marsh Harrier was photographed with a dark plumage and a strikingly white belly, flying south in the dunes near Castricum. A dark plumage with a white belly has occasionally been recorded in Marsh Harriers. Probably the Castricum bird was partially leucistic.
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