Summary
After a decrease and extinction due to deforestation the population has been reestablished by releasing captive-bred owls. Now about 40 territories are occupied with an average density of 0,8–1,0 territories/10 km2. Highest density: 17 territories/80 km2.
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König, C., Kaiser, H. Der Sperlingskauz (Glaucidium passerinum) im Schwarzwald. J Ornithol 126, 443 (1985). https://doi.org/10.1007/BF01643411
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DOI: https://doi.org/10.1007/BF01643411