Mayr, Gerald (2005). " "Old World phorusrhacids" (Aves, Phorusrhacidae): a new look at Strigogyps (" Aenigmavis") sapea (Peters 1987)". PaleoBios. 25 (1): 11–16. 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.

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At the same time, owls are also associated with evil times in Hinduism. At times, Chamunda (fearsome form of Chandi) is depicted seated on an owl, her vahana (mount or vehicle). Hindus believe that owls are messengers of death. [65] [ bettersourceneeded] Native American culturesOn 26 September 2023, RPS employees participated in a successful Mapathon with the Institute of Water Education and the Humanitarian OpenStreetMap Team, focused on aiding areas impacted by the M... The smallest owl—weighing as little as 1 + 3⁄ 32oz) and measuring some 13.5cm ( 5 + 1⁄ 4in)—is the elf owl ( Micrathene whitneyi). [6] Around the same diminutive length, although slightly heavier, are the lesser known long-whiskered owlet ( Xenoglaux loweryi) and Tamaulipas pygmy owl ( Glaucidium sanchezi). [6] The largest owls are two similarly sized eagle owls; the Eurasian eagle-owl ( Bubo bubo) and Blakiston's fish owl ( Bubo blakistoni). The largest females of these species are 71cm (28in) long, have a 190cm (75in) wing span, and weigh 4.2kg ( 9 + 1⁄ 4lb). [6] [7] [8] [9] [10] 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. Juvonen, Arto; Muukkonen, Tomi; Peltomäki, Jari; Varesvuo, Markku (2009). Linnut vauhdissa (in Finnish). Tammi. pp.178, 187. ISBN 978-951-31-4604-7. Account director Paddy Hill said the system is suitable for agencies with staffing levels in excess of 35.

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a b c Martin G.R. (1982). "An owl's eye: schematic optics and visual performance in Strix aluco L". J Comp Physiol. 145 (3): 341–349. doi: 10.1007/BF00619338. S2CID 35039625. Left Strigidae: Tawny owl ( Strix aluco), Eurasian eagle-owl ( Bubo bubo), Little owl ( Athene noctua), Northern saw-whet owl ( Aegolius acadicus); Right Tytonidae: Barn owl ( Tyto alba), Lesser sooty owl ( Tyto multipunctata), Tasmanian masked owl ( Tyto novaehollandiae castanops), Sri Lanka bay owl ( Phodilus assimilis). The Aztecs and the Maya, along with other natives of Mesoamerica, considered the owl a symbol of death and destruction. In fact, the Aztec god of death, Mictlantecuhtli, was often depicted with owls. [70] There is an old saying in Mexico that is still in use: [71] Cuando el tecolote canta, el indio muere ("When the owl cries/sings, the Indian dies"). The Popol Vuh, a Mayan religious text, describes owls as messengers of Xibalba (the Mayan "Place of Fright"). [72] International Science & Engineering Visualization Challenge: Posters & Graphics". Science. 339 (6119): 514–515. 1 February 2013. doi: 10.1126/science.339.6119.514.

Sexual dimorphism is a physical difference between males and females of a species. Female owls are typically larger than the males. [12] The degree of size dimorphism varies across multiple populations and species, and is measured through various traits, such as wing span and body mass. [12]

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Energy exploration, development and optimisation solutions for renewables, power and gas networks, energy storage, oil and gas and nuclear facilties.Prum, R.O. et al. (2015) A comprehensive phylogeny of birds (Aves) using targeted next-generation DNA sequencing. Nature 526, 569–573.

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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 a b Walls G.L. (1942) The vertebrate eye and its adaptive radiation, Cranbook Institute of Science. A different theory suggests that the size difference between male and females is due to sexual selection: since large females can choose their mate and may violently reject a male's sexual advances, smaller male owls that have the ability to escape unreceptive females are more likely to have been selected. [14] a b Krüger, Oliver (September 2005). "The evolution of reversed sexual size dimorphism in hawks, falcons and owls: a comparative study" (PDF). Evolutionary Ecology. 19 (5): 467–486. doi: 10.1007/s10682-005-0293-9. S2CID 22181702.In Mongolia, the owl is regarded as a benign omen. In one story, Genghis Khan was hiding from enemies in a small coppice when an owl roosted in the tree above him, which caused his pursuers to think no man could be hidden there. [53] Environmental consulting solutions for responsible, resilient and sustainable development including impact assessment, ecology and contamination management.