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Résumé :
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The Little Egret Egreeta garzetta, formerly a rare vagrant in Britain, has undergone a remarkable range expansion following a large influx in 1989, and at the end of 1990 it was removed from the list of species considered by the British Birds Rarities Committee. Single-site counts in excess of 100 were made in autumn 1995, with the first site count of more than 200 in autumn 1998. The Little Egret was confirmed as a new British breeding bird in 1996, and by 1999 at least 30 breeding pairs were recorded at a total of nine sites. This paper documents the change in the species non-breeding status in Britain. Using data from the Wetland Bird Survey, with supplementary counts from roost surveys and county bird reports, it is estimated that more than 1,650 Little Egrets were present in September 1999, over 40% of these between Swanage Bay, Dorset, and Pagham Harbour, West Sussex. A further increase in the British population is expected. The increase in Britain has been mirrored in adjacent areas of northwest Europe.
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