Massive pale brown owl with plump, rounded ear tufts. An endangered species, found in mature boreal forests near streams where there are tree cavities suitable for nesting. Preys mostly on fish. Distinguished from Eurasian Eagle-Owl by absence of broad black streaks on breast and rounder, thicker ear tufts that are not held erect. Deep, resonant song, given in duet by pair. Duet consists of three notes, with the first two notes from a male and a third from a female. The lower-pitched female note partially overlaps with the second male note.