Raptors of the World (Princeton Field Guides) by James Ferguson-Lees, David A. Christie

By James Ferguson-Lees, David A. Christie

This new box consultant covers the entire world's kites, vultures, harriers, hawks, buzzards, eagles, and falcons.

in response to crucial sections of the generally acclaimed instruction manual Raptors of the World via a similar authors, yet with up-to-date textual content, maps, and plates, it indicates each species in a variety of alternative plumages, with concise dealing with texts and distribution maps.

It presents an easy-to-use and conveyable connection with one of many world's biggest, most well-liked, and so much hard avian groups.
* a special id advisor to the entire world's raptors
* 118 colour plates convey 338 species in flight and perched
* dealing with textual content summarizes dimension, confusion species, habitat, and behavioral and plumage alterations
* colour distribution maps incorporated for each species
* excellent to be used within the box, anyplace within the world

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Additional resources for Raptors of the World (Princeton Field Guides)

Sample text

Some bird species, however, vary proportionately almost as much in size as do human beings, with both individual and racial differences, and so it is now more customary to give a range of lengths. The birds in a single population will vary by 5–10%; subspecific differences may increase this to 15% or more. Again like human beings, most raptors additionally show sexual dimorphism, for some species and genera very marked, but with the females the larger. Length, to the end of the tail, is taken either from the tip of the bill or from the top of the head.

If you have a good camera and a long lens, try to take a series of photographs showing different angles. At this point, it may be useful to turn to plates 1–3, not least to gain an idea of the great variety of sizes, wing shapes and tail shapes [see also ‘Raptor topography’, figs. 4 & 7]. The wing positions there, however, have intentionally been somewhat sty­lised, and variations can better be judged from the species plates and facing caption texts. A. g. Terathopius B. g. Circus Straight wings C.

Museum skins cannot be relaxed for obtaining such data, and David Noakes, to his great regret, did not think of measuring at least the breadth at the carpal joint when he began his wingspan project. Another useful measurement is the distance, on the folded wing, between the tips of the longest primary and of the first secondary. The standard wing length divided by this wing-tip figure – known as the Kipp Index, because it was used by Kipp (1959) for demonstrating wing-shape differences between resident and migratory birds of various species and subspecies – beautifully illustrates, in combination with the wing/tail index, the varying abilities of different raptor genera to manoeuvre in dense forest as against soaring in open country (Carl Edelstam in litt).

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