Figure 16. — The Pacific flyway. 



of Argentina, where they remain from September to March. Leaving 

 their winter quarters, they cross northwestern South America and the 

 Gulf of Mexico, reaching the North American mainland on the coasts 

 of Texas and Louisiana. Thence they proceed slowly up the Mississippi 

 Valley, and by the early part of June are again on their breeding 

 grounds, having performed a round-trip journey in the form of an 



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