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4475-4478. Voous, Karel H.; Cameron, Ad (illustrator) (1988). Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. v t e...3 KB (347 words) - 14:30, 25 October 2022
Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. Redpath, S. M. (1994). "Censusing Tawny Owls Strix aluco by the use...32 KB (3,915 words) - 15:17, 9 April 2024
Hemisphere. Cameron, Ad (illustrator). London: Collins. pp. 209–219. ISBN 978-0-00-219493-8. Soler, Juan Josė; Møller, Anders Pape (January 1995). "A comparative...45 KB (5,125 words) - 06:05, 25 April 2024
Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. van der Weyden, W. J. (1975). Scops and screech owls: vocal evidence...26 KB (1,972 words) - 15:29, 27 October 2023
Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. Holt, D. W.; Larson, M. D.; Smith, N.; Evans, D. L.; Parmelee, D...201 KB (25,958 words) - 19:32, 18 April 2024
Owls of the Northern Hemisphere. London, Collins. pp. 225–230. ISBN 978-0-00-219493-8. Buchanan, Joseph B.; Gutiérrez, R. J.; Anthony, Robert G.; Cullinan...175 KB (22,178 words) - 06:33, 29 April 2024
Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. Smith, D. G. (2002). Great Horned Owl. Stackpole Books. Wiley, J...264 KB (37,407 words) - 04:30, 9 April 2024
Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. König, Claus; Weick, Friedhelm (2008). Owls of the World (2nd ed...50 KB (7,731 words) - 22:02, 5 February 2023
Owls of the Northern Hemisphere. London, Collins. pp. 209–219. ISBN 978-0-00-219493-8. König, Claus; Weick, Friedhelm (2008). Owls of the World (2nd ed...86 KB (12,409 words) - 14:36, 14 January 2024
