From A Wiki of Ice and Fire - A Song of Ice and Fire & Game of Thrones
Snow shrikes are birds most commonly found in the North, although they have also been observed in the riverlands. They are more easily seen in the deep of winter when woods are stilled by snow.
A Game of Thrones
Catelyn Tully hears the high, sharp trilling of snow shrikes while she awaits the outcome of the Battle of the Whispering Wood.
References and Notes