68 WyomiInc Birps. 
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residents in the mountains, which would indicate that they 
breed there. Metz, Peabody, and Percival also report it. 
619. Bombycilla cedrorum: Cedar Waxwing. 
Common resident in portions of the state. Metz, Black- 
welder, and Clearwaters record it. 
LANIIDAE (Shrikes). 
The Shrikes are flesh eaters exclusively, their food consisting 
of grasshopjers, beetles, mice, and sparrows. During the summer 
months 75 per cent of the food of the Loggerhead Shrike consists 
of grasshoppers. During the winter months they feed upon birds 
and mice. On the whole, the Shrikes are considered beneficial. 
REFERENCES : 
1. Year Book of the Department of Agriculture, 1900, pp. 300- 
302 and 416-417. 
2, Biological Survey Bulletin No. 9, pp. 15-25. 
621. Lanius borealis: Northern Shrike. 
Common winter resident. 
622a. Lanius !udovicianus excubitorides: White-rumped Shrike. 
Common summer resident over most of the state. 
VIREONIDAE (Vireos). 
The Vireos are among the most valuable insect destroyers. 
They are fond of caterpillars and the larvae of beetles which de- 
foliate the trees. They also feed upon aphids and various species 
of beetles, bugs, and orthoptera. Some wild fruits are eaten also. 
The Western Warbling Vireo is the only member of the family 
that is abundant in this state. It feeds almost exclusively upon 
insects that it finds on the aspens and trees of the foothills and along 
the streams. 
REFERENCES : 
1. Biological Survey Bulletin No. 30, pp. 39-40. 
2. Year Book of the Department of Agriculture, 1906, pp. 194- 
195. 
3. Year Book of the Department of Agriculture, 1900, p. 416. 
“Useful Birds and Bheir Protection,” Forebush, pp. 203-208. 
os 
