Sharpies are pretty well-known for attacking larger birds. There's even an
anecdote I ran across that one attacked a Black-crowned Night Heron and
knocked it out of the air, but the outraged squawking of the heron made the
little hawk break off the attack. That story sounds apocryphal to me, but
does justice to the feisty nature of these birds.

The largest prey found in a 1984 survey was a Ruffed Grouse.

And in Michigan a female was captured in 1969 that had three porcupine
quills embedded in its foot.

Paul Webster
Seattle
paul.webster at attbi.com