BIRDS IN THEIR RELATION TO MAN 213 



4. The breeding of fancy pigeons and fowl. 



5. The history of the passenger pigeon. 



6. The work of Audubon. 



7 . Adaptations in bills of birds. 



8. The food of some common birds. 



9. Birds of city parks. 



10. The introduction and spread of the starling. 



References 



Hunter, Essentials of Biology. Chap. XXII. (Birds.) 

 Elements of Biology. Chap. XXV. 



Hodge, Nature Study and Life. Chaps. XVIII, XIX, XX, XXI. 



Osborne, Economic Zoology, p. 417. 



"Four Common Birds of the Garden." Yearbook, Department of 

 Agriculture. 



"Birds as Weed Destroyers." Yearbook, Department of Agriculture, 

 Reprint No. 133. 



"New Facts about the Migration of Birds." Yearbook, Department 

 of Agriculture, Reprint No. 322. 



"Some Common Birds." Farmers' Bulletin, U. S. Department of 

 Agriculture. 



" Importation of Game Birds and Eggs for Propagation." Farmers' 

 Bulletin, U. S. Department of Agriculture. 



"Food of Birds." Biological Bulletin No. 13, U. S. Department of 

 Agriculture, 1900, 5 cents. Address Superintendent of Documents. 



" Relation of Birds to the Cotton-boll Weevil." Biological Bulletin 

 29, 1907, 20 cents. 



" Relation of Birds to the Calif ornian Fruit Trade." Biological Bulle- 

 tin 30, 20 cents. 



Marks and Moody, A Holiday with the Birds. 



Job, H. K., The Sport of Bird Study. 



The Coming of the Birds. 



"The Trick of Bird Photography." Outing Magazine, April, 



1909. 



PROBLEM XL 



How ~birds are of economic importance. 

 a. Food of Birds 



Observations. 1. Fill out the following tabulation on the 

 food of some birds : 



