Crane populations in northern Europe have shown an increasing trend at least over the past 27 years; an average increase of 0.84% per year from 1988 to 2012 and 2.43% per year from 2003 to 2012 (Wetlands International 2016 ).
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Flight Altitude of Common Cranes (<i>Grus grus</i>) Crossing the Arkona Basin (Baltic Sea): Implications for Offshore Wind Farm Development.
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