44 WyomINncG Birps. 
PANDIONIDAE (Ospreys). 
The Osprey lives almost entirely upon fish, which it captures 
alive. If allowed to nest near the barnyard, the Osprey will keep 
all hawks away. 
REFERENCES : 
1. “Useful Birds and Their Protection,’ Massachusetts Board 
of Agriculture, 1913, p. 413. 
2. Hand Book of Birds of Eastern North America, by Chap- 
man, p. 307-308. 
364. Pandion haliaetus carolinensis: Osprey. 
Fairly common near the larger streams where fish are to be 
had. 
STRIGIDAE (Horned Owls, etc.). 
Almost all the Owls of the state are of economic importance. 
They destroy large numbers of rodents. The Long-eared Owls of 
the plains and foothills regions keep up a constant warfare on the 
mice and other small mammals. The Great Horned Owl and its 
sub-species are among the greatest enemies of rats and small ground 
squirrels. Most of the owls also feed upon insects and birds to 
some extent. 
REFERENCES : 
1. Biological Survey Bulletin No. 61. 
2. “Birds in Their Relation to Man,” Weed and Dearborn, pp. 
195-204. 
365. Aluco pratinoola: Barn Owl. 
Accidental. One specimen reported by Mr. M. P. Skinner 
from the Yellowstone Park. 
366. Asio wilsonianus: Long-eared Owl. 
Fairly common on the plains and into the mountain regions 
in southern Wyoming. Less common toward the northern 
part of the state. 
367. Asio flammeus: Short-eared Owl. 
Apparently a rare owl in this state. The only recent rec- 
ords are from Richard, Peabody and Lockwood, all of 
whom indicate that but few occur. 
