Ardea
Official journal of the Netherlands Ornithologists' Union

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Haverschmidt F. (1961) The breeding of the Common Heron in immature plumage. ARDEA 49 (1-2): 72-74
In a small heronry in Holland consisting of 6 nests in 1934 two mixed couples -one bird in immature plumage and the other one an adult- laid eggs. One of these pairs started laying about April 15, laid 4 eggs and reared 3 young. In 1935 one out of 9 pairs was a mixed couple which laid 4 eggs.


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