Literatur
I. H. Owen, Some Breeding-Habits of the Sparrow-Hawk. British Birds, Vol. XII, 1919, pg. 75.
I. H. Owen, Some Breeding-Habits of the Sparrow-Hawk. British Birds, Vol. XII. 1919 pg. 61.
Ders. l. c. Vol. XII. 1919 pg. 63.
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Siewert, H. Bilder aus dem Leben eines Sperberpaares zur Brutzeit. J. Ornithol 78, 245–254 (1930). https://doi.org/10.1007/BF01916294
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DOI: https://doi.org/10.1007/BF01916294