Figure 1 in Altenburg et al. (2025): "Male Barn Swallow on the wing, with the geolocator(stalk) clearly visible (photo Jouke Altenburg, Culemborg, 4 July 2011)."
New publication: Variation in #migrationdistance does not affect arrival date in the subsequent #breedingseason of Dutch #barnswallows. #biodiversity #avianmigration #Hirundorustica
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