sharp-shinned hawk

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A small hawk (Accipiter striatus) of North and Central America that has short rounded wings and a rusty breast and preys on other birds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The smallest hawk to reside in USA and Canada, which preys on songbirds, Accipiter striatus