לילית אפורה
הערות שוליים

↑  לילית אפורה באתר הרשימה האדומה של IUCN
1 2 3 4 5 6 7 8 9 10 11 12  Claus König, Friedhelm Weick and Jan-Hendrik Becking, "Owls of the World" (2nd ed.), p. 382–384, Bloomsbury Publishing, 2009. ISBN 9781408108840.
1 2 3 4  Heimo Mikkola and Alan Sieradzki (April 2012), "Early History of the Great Gray Owl in the New and Old World", Ontario Birds 3(1): 26–29.
↑  "Ageing and Variation of Great Gray Owls", Ontario Field Ornithologists.
1 2  BirdLife International 2012, "Strix nebulosa", In: IUCN Red List of Threatened Species, Version 2013.2. Accessed on 11 May 2014.
↑  Tom Iredale, "Forster, Johann Reinhold (1729–1798)", Australian Dictionary of Biography, National Centre of Biography, Australian National University, published in hardcopy 1966, accessed online 7 May 2014.
↑  Joshua M. Hull et al (2014), "A New Subspecies of Great Gray Owl (Strix nebulosa) in the Sierra Nevada of California, USA.", Journal of Raptor Research 48(1): 68-77.
↑  Joshua M. Hull et al (2010), "Range-wide genetic differentiation among North American great gray owls (Strix nebulosa) reveals a distinct lineage restricted to the Sierra Nevada, California.", Molecular Phylogenetics and Evolution, 56(1): 212-221.
↑  Heimo Mikkola, Risto Tornberg and David E. Willard (Dec 2013), "Sex-related dietary differences in Great Gray Owls in Finland and the USA", Ontario Birds 31(3):160-171.
↑  Stephen Charles Brown, "Arctic Wings: Birds of the Arctic National Wildlife Refuge", Volume 2: p. 117; Braided River, 2006. ISBN 9780898869750.
1 2 3  "Great Grey Owl", Birds > Our Animals, Dudley Zoological Gardens
1 2 3 4 5 6  Heimo Mikkola, "Owls of the World: A Photographic Guide".
1 2 3  Paul Bannick and Martyn Stewart, "The Owl and the Woodpecker: Encounters with North America's Most Iconic Birds", p. 162, The Mountaineers Books, 2008. ISBN 9781594850950.
1 2 3  "Great Grey Owl (Strix nebulosa)", The Owl Foundation.
↑  Philip J. Currie, "Feathered Dragons: Studies on the Transition from Dinosaurs to Birds", Indiana University Press, 2004. ISBN 9780253343734.
↑  Pei-ji Chen, Yuan Wang, Yuan-qing Wang and Mee-Mann Chan; "The Jehol Fossils: The Emergence of Feathered Dinosaurs, Beaked Birds and Flowering Plants", Academic Press, 2011. ISBN 9780080557885
↑  John A. Long and Peter Schouten, "Feathered Dinosaurs: The Origin of Birds", Oxford University Press, 2008. ISBN 9780195372663.
1 2  "Great Gray Owl", Birds > Animals > Nature & Science, "Yosemite National Park California", National Park Service U.S. Department of the Interior.
1 2  "Cutting for Wildlife", Nature North.
1 2 3 4  "Manitoba's Provincial Bird Emblem, The Great Gray Owl", Naturenorth. Accessed online 7 may, 2014.
1 2 3 4 5  E. L. Bull and M. G. Henjum "Ecology of the great gray owl".
↑  Donald S. Heintzelman, "Hawks and Owls of Eastern North America".
↑  Verna R. Johnston and Carla J. Simmons, "California Forests and Woodlands: A Natural History", p. 138–139, University of California Press, 1996. ISBN 9780520202481.
↑  Allan P. Sandilands, "Birds of Ontario: Habitat Requirements, Limiting Factors, and Status".
1 2  "Strix nebulosa Great Gray Owl", BC Conservation Data Centre: Species Summary, Ministry of Environment, The Province of British Columbia government website.
↑  "Threatened and Endangered Birds", Threatened and Endangered Species > Nongame Wildlife Program > Wildlife Programs, California Department of Fish and Wildlife.
↑  T. D. Rich et al (2004), Partners in flight: North American landbird conservation plan, Cornell Lab of Ornithology, Ithaca, NY.
1 2 3 4  Tim Osborne (1994), "Great Gray Owl", Birds > Animals > You are here: ADF&G Home » Species > Alaska Department of Fish and Game.
1 2  Elena D. Ulev (2007), "Strix nebulosa" In: Fire Effects Information System, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Accessed 14 May 2014.
1 2  Kim Long, "Owls: A Wildlife Handbook".
↑  Robert W. Nero, "Great Gray Owl: Phantom of the Northern Forest", Smithsonian Institution Press, 1987. ISBN 9780874746730.
↑  "Errol", Harry Potter Wiki.
↑  "Twilight", Guardians of Ga'Hoole Wiki.
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בקרת זהויות :  NLI: 987007540908105171  GND: 4144072-9  LCCN: sh85056984 
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