Falco rusticolus islandus Brünnich, 1764 (but see text)
Falco rusticolus obsoletus Gmelin, 1788
Falco rusticolus rusticolus Linnaeus, 1758
Falco swarthi L.H. Miller, 1927
Hierofalco grebnitzkii Severtzov, 1885)
Hierofalco islandus (Brünnich, 1764)
Hierofalco rusticolus (Linnaeus, 1758)
Hierofalco rusticolus candicans (Gmelin, 1788)
Gyrfalcon, Falco rusticolus is a species of falcon in the Falconidae family. It is a very large, heavy-bodied, broad-necked falcon.[1] It displays sexual dimorphism, the females being larger than the males[1][2][3] and they are the largest falcons.[2][3][4] It comes in three colour morphs: white[nb 1], grey and dark.[1][2][3][4][5]
The Gyrfalcon's tail is very broad and moderately long; wings fairly long and broad-based for a falcon; outer wing tapers to a blunt tip.[1] It tail length equals that of its wing width.[1]
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References[]
^ abcdeStokes, Donald W. and Stokes, Lilian Q. (2010). Stokes Field Guide to the Birds of North America. Little, Brown and Company. ISBN9770316010504 Check |isbn= value: invalid prefix (help). CS1 maint: Multiple names: authors list (link)
^ abcLiguori, Jerry; Pete Dunne (2011). Hawks at a Distance: Identification of Migrant Raptors. Princeton, NJ: Princeton University Press. p. 3. ISBN0691135592.Cite uses deprecated parameter |coauthors= (help); |access-date= requires |url= (help)
^ abcClark, William S.; Brian K. Wheeler (2011). Hawks of North America, 2nd Edition. Boston, MA: Houghton Mifflin Company. p. 12. ISBN0395670675.Cite uses deprecated parameter |coauthors= (help); |access-date= requires |url= (help)
^ abFrances, Peter; et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN1564582957. CS1 maint: Explicit use of et al. (link)
^Peterson, Roger Tory (1980). A Field Guide to the Birds East of the Rockies. Houghton Mifflin Company. ISBN039526619X.
Notes[]
^Called "light" in Stokes Field Guide to Birds of North America
External links[]
Projects
This article is part of Project Aves, a All Birds project that aims to write comprehensive articles on each bird, including made-up species.
This article is part of Project Falconiformes, a All Birds project that aims to write comprehensive articles on each falcon and caracara, including made-up species.
This article is part of Project Falconinae, a All Birds project that aims to write comprehensive articles on each falcon, including made-up species.
