figure 3. — Migration of the clifF swallow, a day migrant that instead 

 of flying across the Caribbean Sea as does the blackpolled warbler 

 (see fig. 6), follows around the coast of Central America, where food 

 is readily obtained. (See p. 25.) 



South America, at which season they are neighbors. But when the 

 impulse comes to start northward toward their respective breeding 

 grounds, the warblers strike straight across the Caribbean Sea to Florida 

 (fig. 6), while the swallows begin their journey by a westward flight 

 of several hundred miles to Panama (fig. 3.). Thence they move 

 leisurely along the western shore of the Caribbean Sea to Mexico, and 

 continuing to avoid a long trip over water, they go completely around 



17 



