The Arctic warbler is an “Old World” warbler species, not closely related to the colorful wood warblers common in the eastern United States, Senner said. “They migrate each year to southeast Asia and the Philippines to join other Old World warbler species.”

 

The small, drab bird breeds in the willow thickets across Eurasia and into the sub-Arctic and Arctic of Alaska, the Cornell Lab of Ornithology reported.