Location in Oregon
Blue is Winter range - Red is Summer range
Purple is Year-round range - Yellow is Migration range

Northern Saw-whet Owl

Aegolius acadicus - The only tiny tuftless owl likely to be seen in the central and eastern states. Commoner than generally believed, but nocturnal and seldom seen unless found roosting in dense young evergreens or in thickets. In the west it overlaps the range of the Flammulated Owl and the Northern Pigmy-Owl, which is slender and long-tailed with dark brown streaks on flanks. Common call is a long series of short whistles.