Download PDF by Eugene Potapov: The Gyrfalcon (Poyser Monographs)

By Eugene Potapov

ISBN-10: 0713665637

ISBN-13: 9780713665635

This ebook is the 1st monograph on some of the most attractive and in demand birds on this planet. The Gyrfalcon is the world's greatest and strongest falcon - a very awe-inspiring fowl which inhabits the ferociously inhospitable Arctic taiga, from Greenland and Iceland correct throughout Siberia and northerly Canada. Its plumage varies from a dismal mottled gray to natural white - the white birds specifically are coveted by means of birders and falconers. Like different titles within the sequence, it covers all elements of the species' biology, taxonomy, distribution, prestige and ancient institutions with mankind. the result's an exhaustively researched and enthrallingly readable biography of a miraculous fowl, illustrated all through with photos and line drawings. "a solid learn, featuring a lot formerly inaccessible info, in addition to a few fascinating insights into probably the most distant and inhospitable locations on earth." British Birds

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Greenland), Finland, Iceland, Norway, Russia, Sweden and the USA. In addition there were a number of skins from countries where Gyrfalcons do not breed, but occur sporadically while wintering or on migration, and some birds obtained on vessels in the open sea. 2. A total of 59 skins were not labelled well enough for the country of origin to be identified with certainty. 3. Seventy-four of the preserved skins were not labelled well enough to determine the region of procurement. The geographical coordinates of the locations were taken from GIS97 digital maps, for Russian locations, and from the Atlas of the World (OUP 2002).

The body length is 48–61cm, the wingspan 130–160cm (Cramp and Simmons 1980, Clum and Cade 1994). The bird looks heavy and flies in a ‘heavy falcon’ style; it is remarkably fast compared to its rather slow wing beat. Its wide wings do make it sometimes look like a Goshawk, but the wing beats are a good key to identification at a distance, just as the Peregrine, with its swift-like wing beats, can be easily distinguished. In addition, the ‘barrel-shaped’ body (Forsman 1999) helps to identify the species.

The dark spots do not reflect UV, but peak in the near-infrared part of the spectrum (c. 1,050nm). The latter peak is not shown in the graphs, but there is some evidence that it is very similar in other ‘brown’ looking birds of prey such as buzzards and Black Vultures. Thirdly, there is no sex difference in the reflecting patterns of black spots across all three morphs. The only sex difference was found in the reflection of white patches or white backgrounds of the primaries and, in some morphs, in the reflection of the rectrices.

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The Gyrfalcon (Poyser Monographs) by Eugene Potapov

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