It is the thrush mentioned in moon-runes on Thorin's map. ' "Stand by the grey stone when the thrush knocks," read Elrond, "and the setting sun with the last light of Durin's day will shine upon the key-hole." ' -page 50 of The Hobbit, by J.R.R Tolkein. (I don't own anything!) It is knocking on the door of Erebor with a snail, which shows the dwarves and Bilbo how to get in. (on page 189)
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A thrush is a small bird although Tolkien describes this particular thrush as rather larger than is usual.
The thrush is the one who informs the dwarves that Smaug is dead and that the lake-town people and elves are coming to ask for a part of the treasure to rebuild their city that was destroyed.
The thrush overheard the conversation that Bilbo had with the dragon about the spot.
The Old Thrush, one of the species of Great Thrush that lived in the Esgaroth region, told Bard that Smaug had a hole in his armored chest right over his heart.
There were many things written on the map, but one of the most important things was, "Stand by the grey stone when the thrush knocks, and the setting sun with the last light will shine on Durin's Day will shine upon the key-hole."
An old raven, son of Carc, chief of all ravens.
Stand by the grey stone when the thrush knocks, and the setting sun with the last light of Durin's Day will shine upon the key-hole