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Norberg, R.A. (31 August 1977). "Occurrence and independent evolution of bilateral ear asymmetry in owls and implications on owl taxonomy". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 280 (973): 375–408. Bibcode: 1977RSPTB.280..375N. doi: 10.1098/rstb.1977.0116.
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Strigidae A long-eared owl ( Asio otus) in an erect pose The laughing owl ( Ninox albifacies), last seen in 1914 We strive to solve problems in pragmatic ways. We're passionate about delivering results. We ask questions. We define problems. We make complex easy.
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Mayr, Gerald; Kitchener, Andrew C. (2022). "Early Eocene fossil illuminates the ancestral (diurnal) ecomorphology of owls and documents a mosaic evolution of the strigiform body plan". Ibis. 165: 231–247. doi: 10.1111/ibi.13125. ISSN 0019-1019. S2CID 251455832.a b c Lundberg, Arne (May 1986). "Adaptive advantages of reversed sexual size dimorphism in European owls". Ornis Scandinavica. 17 (2): 133–140. doi: 10.2307/3676862. JSTOR 3676862. Palaeobyas (Late Eocene/Early Oligocene of Quercy, France) Tytonidae? Sophiornithidae? [ citation needed] Behavior Comparison of an owl (left) and hawk (right) remex. The serrations on the leading edge of an owl's flight feathers reduce noise Owl eyes each have nictitating membranes that can move independently of each other, as seen on this spotted eagle-owl in Johannesburg, South Africa. Peters, Dieter Stefan (January 2007). "The fossil family Ameghinornithidae (Mourer-Chauviré 1981): a short synopsis" (PDF). Journal of Ornithology. 148 (1): 25–28. doi: 10.1007/s10336-006-0095-z. S2CID 27322057. Archived (PDF) from the original on 9 October 2022. Mayr, Gerald (2005). " "Old World phorusrhacids" (Aves, Phorusrhacidae): a new look at Strigogyps (" Aenigmavis") sapea (Peters 1987)". PaleoBios. 25 (1): 11–16.