Specialist training services, programs and accreditation for health, safety and risk, project management, and energy sector capability development. Cuando el tecolote canta, el indio muere". La Cronica. 27 July 2008. Archived from the original on 3 September 2010. {{ cite web}}: CS1 maint: bot: original URL status unknown ( link) Mayr, Gerald (2005). " "Old World phorusrhacids" (Aves, Phorusrhacidae): a new look at Strigogyps (" Aenigmavis") sapea (Peters 1987)". PaleoBios. 25 (1): 11–16.

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Heinrich, Bernd (1987): One Man's Owl. Princeton, N.J.: Princeton University Press. ISBN 978-0-691-08470-1. OCLC 15486687. Another popular theory suggests that females have not been selected to be smaller like male owls because of their sexual roles. In many species, female owls may not leave the nest. Therefore, females may have a larger mass to allow them to go for a longer period of time without starving. For example, one hypothesized sexual role is that larger females are more capable of dismembering prey and feeding it to their young, hence female owls are larger than their male counterparts. [12] The Yakama tribes use an owl as a totem, to guide where and how forests and natural resources are useful with management. [77] Rodent control A purpose-built owl-house or owlery at a farm near Morton on the Hill, England (2006) See also: List of Strigiformes by population The snowy owl is very endangered in Scandinavia [81] and Finland, where it is found only in northern Lapland. [82] Calaprice, Alice & Heinrich, Bernd (1990): Owl in the House: A Naturalist's Diary. Joy Street Books, Boston. ISBN 0-316-35456-2.

The beak of the owl is short, curved, and downward-facing, and typically hooked at the tip for gripping and tearing its prey. Once prey is captured, the scissor motion of the top and lower bill is used to tear the tissue and kill. The sharp lower edge of the upper bill works in coordination with the sharp upper edge of the lower bill to deliver this motion. The downward-facing beak allows the owl's field of vision to be clear, as well as directing sound into the ears without deflecting sound waves away from the face. [33] Camouflage The snowy owl has effective snow camouflage

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Houde, Peter; Braun, Edward L.; Narula, Nitish; Minjares, Uriel; Mirarab, Siavash (2019). "Phylogenetic Signal of Indels and the Neoavian Radiation". Diversity. 11 (7): 108. doi: 10.3390/d11070108. ISSN 1424-2818. Some 220 to 225 extant species of owls are known, subdivided into two families: 1. true owls or typical owls family ( Strigidae) and 2. barn-owls family ( Tytonidae). Some entirely extinct families have also been erected based on fossil remains; these differ much from modern owls in being less specialized or specialized in a very different way (such as the terrestrial Sophiornithidae). The Paleocene genera Berruornis and Ogygoptynx show that owls were already present as a distinct lineage some 60–57 million years ago (Mya), hence, possibly also some 5 million years earlier, at the extinction of the non-avian dinosaurs. This makes them one of the oldest known groups of non- Galloanserae landbirds. The supposed " Cretaceous owls" Bradycneme and Heptasteornis are apparently non- avialan maniraptors. [41] Dubow, Charles (1 January 2004). "Hangover Cures". Forbes. Archived from the original on 17 January 2003. Johnsgard, Paul A. (2002): North American Owls: Biology and Natural History, 2nd ed. Smithsonian Institution Press, Washington, D.C. ISBN 1-56098-939-4. Design, technical and advisory services for the property sector, including residential, commercial, retail, industrial, health, education and data centre projects.

Discover our industry-leading strategy, design and management solutions for wastewater, groundwater, flooding, drainage and network infrastructure. Lenders, E. W. (1914). "The Myth of the 'Wah-ru-hap-ah-rah,' or the Sacred Warclub Bundle". Zeitschrift für Ethnologie. 46: 404–420 (409). Communications, creative and digital solutions for governments and businesses including community engagement, design, research, data and software development. For fossil species and paleosubspecies of extant taxa, see the genus and species articles. For a full list of extant and recently extinct owls, see the article List of owl species. The supposed fossil herons "Ardea" perplexa (Middle Miocene of Sansan, France) and "Ardea" lignitum (Late Pliocene of Germany) were more probably owls; the latter was apparently close to the modern genus Bubo. Judging from this, the Late Miocene remains from France described as "Ardea" aureliensis should also be restudied. [42] The Messelasturidae, some of which were initially believed to be basal Strigiformes, are now generally accepted to be diurnal birds of prey showing some convergent evolution toward owls. The taxa often united under Strigogyps [43] were formerly placed in part with the owls, specifically the Sophiornithidae; they appear to be Ameghinornithidae instead. [44] [45] [46] The ancient fossil owl Palaeoglaux artophoron