Thrushes
From Tolkien Gateway
File:The Old Thrush.jpg
The Old Thrush by Mark Poole
Thrushes were large speckled brown birds with a special fondness for snails, whose shells they remove by breaking them against stones. A thrush of Erebor was instrumental in the downfall of Smaug.
Men of Lake-town and Dale could understand the language of the thrushes, and some thrushes could understand the common tongue.
