Jan., 1909. Birds of Illinois and Wisconsin — Cory. 



479 



Duck Hawk. 



The nest is placed on cliffs or in hollows in branches of large trees. 

 It has also been known to nest on the ground. The nests found near 

 Mt. Carmel were placed in cavities in the tops of very large sycamore 

 trees. The eggs are two to four, rarely five. They are dull white, 

 washed and blotched with different shades of brown, and measure 

 about 2.20 X 1.70 inches. 



Subgenus TINNUNCUI.US Vieill. 



170. Falco columbarius Linn. 

 Pigeon Hawk. 

 Distr. : North America, West Indies, south to northern South 

 America; breeds from the northern border of United States north- 

 ward. 



Adult: Second primary but slightly longer than the third; upper 

 plumage, slate color; back and sides of neck, marked with tawny 



