. Cyclopedia of farm animals. Domestic animals; Animal products. Fig. 150. Head of black-footed ferret (Putorius nigripes). (After Biological Survey.) The Pocket Gophers of the United States, Bulletin No. 5 ; Same, Destruction of Wolves and Coyotes, Circular No. 55 ; Same, Wolves in Relation to Stock, Forest Service Bulletin No. 72 ; David E. Lantz, Coy- otes in their Economic Relations, Bulletin No. 20, and Farmers' Bulletin No. 226 ; Same, Methods of Destroying Rats, Farmers' Bulletin No. 297 ; Same, Destroying Pocket Gophers. Circular No. 52 ; Same, An Economic Study of Field Mice, Bulletin
. Cyclopedia of farm animals. Domestic animals; Animal products. Fig. 150. Head of black-footed ferret (Putorius nigripes). (After Biological Survey.) The Pocket Gophers of the United States, Bulletin No. 5 ; Same, Destruction of Wolves and Coyotes, Circular No. 55 ; Same, Wolves in Relation to Stock, Forest Service Bulletin No. 72 ; David E. Lantz, Coy- otes in their Economic Relations, Bulletin No. 20, and Farmers' Bulletin No. 226 ; Same, Methods of Destroying Rats, Farmers' Bulletin No. 297 ; Same, Destroying Pocket Gophers. Circular No. 52 ; Same, An Economic Study of Field Mice, Bulletin No. 31; C. Hart Merriam, Revision of the Pocket Gophers, North American Fauna, No. 8 ; Same, Synopsis of the Weasels, North American Fauna, No. 11; Same, Prairie Dogs, Yearbook, 1901, and Circular No. 32; T. S. Palmer, The Jack Rabbits of the United States, Bulletin No. 80. Valuable articles have been pub- lished by some of the agricultural experiment stations, notably in Bulletin No. 129, of the Kan- sas Station, in which David E. Lantz discusses Kansas mammals in relation to agriculture, and in Bulletin No. 58 of the Nevada Station, in which Peter Frandsen discusses ground-squirrels and other rodent pests. BIRDS IN THEIR RELATIONS WITH AGRICULTURE By Edward Howe Forbush The relations of certain birds to agriculture are so complicated that they are not yet fully compre- hended even by the economic ornithologist, and they are often entirely misunderstood by the farmer. When a few species of birds destroy the fanner's grain, fruit or poultry, the injury is con- spicuously evident; but many species feed on the enemies of grain, fruit and poultry, as well as on those of trees and crops of all kinds, and these beneficial habits of the many usually escape notice, while the harmful habits of the few become widely known. The food relations existing between birds, in- sects, other animals and plants are so obscure, and the results of the feeding habits of birds are so far-reaching, th
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