In late February and in March, you may hear an unusual bird song in the Willamette Valley. It's a single ethereal note, about 1.5 seconds long, often with a trill or buzzy quality. Varied thrushes spend the winter in the Willamette Valley and look similar to American robins (a closely related species). By late March, they migrate to their mountain breeding grounds. Before they leave, they began to sing. You can find them in summer in Cascades and on Marys Peak.