FAMILY SULIDAE 



57 



any length of time. Such unsuspicious individuals sometimes ride 

 along near at hand on the favorable air currents generated by the 

 passage of the launch. 



When fish are sighted they plunge, often from a fair height, 



Fig. 11. — Brown booby, piquero moreno, Sula leucogaster. 



sometimes directly down, sometimes at an angle. As they surface 

 after a dive they are headed in the same direction as when they 

 entered the water, since they do not turn and reverse as does the 

 brown pelican. 



Boobies in their search for food are birds of the sea, the isthmus 

 forming a barrier of land that they do not cross. While the present 



