The Hawks of the Canadian Prairie Provinces in Their Relation to Agriculture
The Hawks of the Canadian Prairie Provinces in Their Relation to Agriculture
P a Percy Algernon Taverner
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The Red-tailed Hawk (length 20-24 inches) (Plate II B) is the largest of American hawks excepting the two Rough-legs. It probably weighs as much as either of these or perhaps more, but owing to its closer feathering it usually appears to be smaller. In most characteristic Figure 1. Notched primaries (four) of Red-tail and Rough-leg. Figure 2. Notched primaries (three) of Swainson's Hawk. adult plumage it is brown above and white below with a rusty red tail and more or less dark striping on side...s of breast. As individuals tend more towards the dark phase the dark flank and breast marks extend and coalesce and the tail is barred with the same colour and often becomes all brown with lighter bars. The typical light juvenile is all brown above, including tail which is barred with lighter, and white below with broad dark stripes on flanks and sides of breast. No reliable colour 8 MUSEUM BULLETIN NO. 28. distinction can be drawn between this hawk and the next species. , Swainson's Hawk, and it may often be confused with it except when it has the red tail.
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