480 Field Museum of Natural History — Zoology, Vol. IX. 



Pigeon Hawk. 



and buff; primaries, slaty brown, barred with white; on inner webs, 

 brownish black, barred and tipped with grayish white; under parts, 

 tawny buflf, thickly streaked with brown except on the throat. 



Immature: Upper plumage, dark grayish brown; crown with 

 narrow dark streaks; throat, whitish; under parts, tawny or buffy 

 white, streaked with brown; primaries, barred with pale rufous buff; 

 tail, barred with pale buff and tipped with dull white. 



Male: Length, 10.25 to 11.25; wing, 7.45 to 7.80; tail, about 5; 

 tarsus, 1.35. 



Female: Length, 12 to 13; wing, 8.25 to 8.50; tail, about 5.40; 

 tarsus, 1.55. 



The Pigeon Hawk is not uncommon during the migrations in 

 spring and fall in Illinois and Wisconsin and it has occasionally been 

 observed in summer. Kumlien and HoUister consider it "A rare 

 summer resident in southern Wisconsin, but it not infrequently re- 

 mains in the central and northern parts of the state. Dr. Hoy speaks 

 of its nesting near Racine in 1852." (Birds of Wisconsin, 1903, p. 66.) 



Nests on cliffs or in hollows in large trees. The eggs are four or 

 five, very variable in color, ranging from dull white, faintly spotted, 

 to brown, either washed or heavily blotched with different shades of 

 reddish brown or dark brown. They measure about 1.60 x 1.25 inches. 



