Starlings
From Tolkien Gateway
Starlings was one of the many species of birds found in Middle-earth. After Smaug's death many birds were gathering around Erebor. Thorin saw among them "starlings and flocks of finches".[1]
Tom Bombadil mentions starlings in his song Hey dol! merry dol! ring a dong dillo! in the Old Forest: "Light goes the weather-wind and the feathered starling."[2] He himself is compared to a starling when he comes to the room in his house where the Hobbits had been sleeping: "Tom was moving about the room whistling like a starling."[3]