58 Cincinnati Society of Natural History. 



Note on Cooper's Hawk 



ACCIPITER COOPERI 



A female of this hawk, while in pursuit of a wood thrush, 

 Hew against a large plate-glass window in Avondale with such 

 terrific force that both the thrush and the hawk were instantly 

 killed. The reflection of trees and shrubbery opposite the 

 window caused the illusion of an open space with trees beyond, 

 that deceived both birds, and the thrush, hoping to escape, was 

 dashed to death, as was also the hawk. This window has 

 proved a death trap for birds, others having been destroyed in 

 this way. The stomach of the hawk was entirely empty. It 

 was in beautiful plumage and has been preserved. 



Bald Eagles 



Hali^tus leucocephalus 



October 22, 1907, six of these birds were observed sailing 

 over Cincinnati (Avondale) high up in the air. They kept 

 together and sailed in small circles, drifting slowly from the 

 northwest to southeast, where they disappeared from view. 

 Two had the heads and tails white, the others were in the dark 

 plumage. 



How Weeds are Introduced by Birds 



A vacant lot next to my home had the soil taken off, leaving 

 only the subsoil exposed. Not a bit of vegetation was left 

 and the surface was bare. In five years this lot was a dense 

 jungle of weeds, the most conspicuous being sweet-scented 

 clover {Melilotus alba) and Canada thistle (Cirsium arvense), 

 though I recognized many other noxious weeds and coarse, 

 worthless grasses — how did they come there ? The abutting 

 lots were covered with clean bluegrass sod. They were con- 

 veyed by birds, and must have been carried some distance. 

 Several species of sparrows were observed to frequent the 

 place. The tenacity with which these tough and hardy weeds 

 maintain their existence is very remarkable, and I found it 

 difficult to eradicate them. Doubtless the place was reseeded 



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