15 
to carry off quail or young poultry heavier than itself. It is one 
of the few hawks that should be killed whenever possible. 
1388. COOPER HAWK. Accipeter cooperi. 
Rather common winter residents of the valleys. Occasional 
summer residents and breed in the mountains. Very destructive 
of poultry and game birds. This is the Hawk principally responsi- 
ble for the bad name given all hawks. It deserves no mercy. 
138a. WESTERN GOSHAWK. Astur atricapillus striatulus. 
One shot by Rudolph Wueste at the Lower Otay Reservoir 
(about five miles from the Lower California line) November 9. 
1916, is now in the Museum of Natural History at San Diego, 
189. HARRIS HAWK. Parabuteo unicinctus harrisi. 
Stragglers from the Colorado valley or Lower California. One 
shot in Mission Valley now in the Natural History Museum, others 
have been seen. 
140. WESTERN RED-TAILED HAWK. Buteo borealis 
calurus. 
Common residents throughout the county, least common in 
winter. Often called “Chicken Hawk” and ‘Hen Hawk.” Oc- 
casionally a young Hawk in its first autumn will catch a chicken, 
but this rarely happens and after the young Hawk becomes expert 
in hunting it does not bother poultry, but subsists on ground 
squirrels, rabbits, mice and grasshoppers, and is far more bene- 
ficial than injurious. 
141. RED-BELLIED HAWK. Buteo lineatus elegans. 
Rather rare residents of the valleys, generally only in those 
containing willow or‘ cottonwood groves. The food is meadow 
mice, frogs and insects. 
142. ZONE-TAILED HAWK. Buteo abbreviatus. 
Rare stragglers from Lower California. Several have been 
taken in the county. 
143. SWAINSON HAWK. Buteo swainsoni. 
Rather common summer residents of the valleys and foothills. 
Migrates in flocks. The food is aig Sa grasshoppers and 
beetles, with some mice. Never harm poultry. Probably the 
most beneficial of our hawks. Should never be killed. 
144. FERRUGINEOUS ROUGH-LEG HAWK. CALI- 
FORNIA SQUIRREL HAWK. Archibuteo ferrugineus. 
These large hawks are rather rare winter residents; formerly 
they were more common. They frequent open valleys and prey 
on ground squirrels and mice. They are highly beneficial. 
145. GOLDEN EAGLE. Aquila chrysaetos. 
Uncommon residents of foothills and mountains. Food is rab- 
bits, squirrels and waterfowl. 
146. BALD EAGLE. Halizxetos ii ie one 
Rare residents of the seacoast and islands. Their food is 
mostly fish. 
147. PRAIRIE FALCON. Falco mexicanus. 
Rare residents of the foothills. Food mostly squirrels, rabbits, 
quail, etc. but occasionally poultry. 
