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Schmitz, A., Ponitz, B., Brücker, C. , Schmitz, H., Herweg, J. & Bleckmann, H.view all authors (2015). Morphological properties of the last primaries, the tail feathers, and the alulae of Accipiter nisus, Columba livia, Falco peregrinus, and Falco tinnunculus. Journal of Morphology, 276(1), pp. 33-46. doi: 10.1002/jmor.20317