Cambridge 
1891. 
liay 4. 
Acoi'!)iter velox . 
llass. 
on first entering the Maple Swamp I had twice started a 
bird at which I could not get a fair sight but which flitted 
along close to the groimd among dense bushes precisely lihe a 
Robin. It appeared much larger, however, and I set it down 
as a Sharp-shinned Hawk, a surmise which proved correct for 
returning past the edge of the woods I saw it rise and fly 
off over the open, soaring a little in narrow circles, and 
finally disappearing towards the north. I have observed the 
Rob in-1 ihe flight just mentioned on many previous occasions. 
As far as I know it is peculiar to this species. Is it an 
instance of mimicry designed to enable the Hawk to get near 
its victims without alarming them? 
