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Hoyo et al. 1994). However, recent population data                 Vol. 1. Perdisa Editore, Bologna, Italy.
have shown notable increases in northern and east-
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This trend is confirmed by migration counts made               CLARKE, R. 1995. The Marsh Harrier. Hamlyn, London, U.K.
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2003, Sammut and Bonavia 2004). Further conser-                    niches of sympatric Marsh Harriers Circus aeruginosus
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potential threats posed by illegal harvesting in Malta             winter. Ibis 135:424–431.
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al. 2007).                                                         the Second International Conference on Raptors, Ur-
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