August, 1918< 
Canada 
Geological Survey 
Museum Bulletin No. 28 
BIOLOGICAL SERIES, No. 7. 
CONTENTS. 
Introduction 
Vultures. 
Harriers 
Accipiters. 
Buteos’and Rougli-legs 
Eagles ....... 
Falcons. 
Fish Hawk. 
Page. 
1 
2 
2 
3 
5 
10 
10 
12 
Illustrations. 
Plate I. A. Marsh Hawk, adult male and juvenile .... - 
B. Goshawk, adult and juvenile ; * ■ 
II. A. Sliarp-flhiimod Hawk, adult, and juvenile. In colour almost indis- 
tinguishable from Cooper’s Hawk . . — — 
B. Rod-tailed Hawk, adult and juvenile in most characteristic plumage. 
III. A. Swamsons Hawk. Partial light phase and dark phase 
B. Duck Hawk, adult and juvenile. 
IV. A. Sparrow Hawk, male and female. 
B. Osprey. . . ■ 
Figure 1. Notched primaries (four) of Red-tail and Rough-leg,, 
' 2. Notched primaries (three) of Swainson’s Hawk. 
3. Feathered leg of Rough-leg and Golden Eagle . . 
4. Narrow bill of American Rough-leg 
5. Wide bill of Ferruginous Rough-leg * 
6. Toothed bill of Falcons. 
7. Untoothed bill of all other hawks 
IS 
15 
16 
16 
17 
17 
18 
18 
7 
7 
8 
9 
9 
11 
11 
1 
