Accipitor cooperii . 
Ball's Hill, Concord, Mass. 
1897. On the afternoon of the 4th I started a very blue -bached 
April 1-5. male Cooper's Hawk from an oak near Bensen's landing. Cross- 
ing the open field it disappeared among the pines on the crest 
of Ball's Hill. Returning the same way fully an hour later I 
flushed a large cock Partridge which also flew towards the pine* 
| just mentioned. Less than a minute after it had passed beyond 
my sight it reappeared coining directly back over my head with 
the Cooper's Hawk in hot pursuit but fully one hundred yards 
in the rear. The Partridge went fully three yards to the 
Hawk's one and had disappeared in the woods towards Holden's 
Hill before the Hawk came to where I was standing but the 
latter bird kept steadily on its track like a hound on a keen 
scent and I noticed that when it came to a cut in the top a- 
■ 
round which the Partridge had curved sharply it took exactly 
the same curve. I. do not believe, however, that it caught 
the Partridge. 
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