From A Wiki of Ice and Fire
Snow shrikes are birds most commonly found in the north, although they might also be found in the riverlands. They are more easily seen in the deep of winter when woods are stilled by snow.
A Game of Thrones
While waiting in a forest between Blue Fork and the Tumblestone within the riverlands, Catelyn Stark hears the high, sharp trilling of snow shrikes; it is unknown if they are actually bird calls or instead signaling by northmen to begin the battle in the Whispering Wood.
Sometimes you saw them in the deep of winter, when the godswood was white and still. They were northern birds.—thoughts of Catelyn Stark
- ↑ 1.0 1.1 1.2 A Game of Thrones, Chapter 63, Catelyn X.