A comparison of colour morphs of breeding Buzzards in Switzerland (N=35, based on observations in 2013) and the northern Netherlands (N=91, in 2010-13) showed that on average Swiss Buzzards were less variable and darker than Dutch Buzzards. In fact, no light morph Buzzards were recorded in the Swiss sample.

De Takkeling

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Werkgroep Roofvogels Nederland

V.S. van Bergen, & R. Riem Vis. (2015). Kleurstelling van een Zwitserse buizerdpopulatie Buteo buteo in vergelijking met een Nederlandse. De Takkeling, 23(3), 241–244.