AVES 369 



4. Disseminators of injurious seeds and parasitic animals. 

 Even our valuable game birds may be the means of dispersing 

 parasitic worms and protozoa, and it is a well-known fact that the 

 starling, introduced into New Zealand, spread the seeds of the 

 English blackberry, with the result that the thorny bushes form a 

 snare for lambs and interfere with cultivation. 



References on Birds 



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States in Relation to Agriculture. Farmers' Bull. no. 755, U. S. 



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 Bradley, O. C. 1915. The Structure of the Fowl. A. and C. Black, 



Ltd., London. 

 Chapman, F. M. 1910. Birds of Eastern North America. New York. 

 Chapman, F. M. 1903. Color Key to North American Birds. New 



York. 

 Fisher, A. K. 1908. Economic Value of Predaceous Birds and Mam- 

 mals. Yearbook of the U. S. Dept. Agr. 

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State Board of Agriculture. 

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Massachusetts State Board of Agriculture. 

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and Rapacious Birds in Relation to Man. Farmers' Bull. no. 497. 

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N. Y. 

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J. B. Lippincott Co., Philadelphia, Pa. 



