somewhat stockier in build yet shorter tailed than the Ural owl.<ref name= HBW>Holt, D.W., Berkley, R., Deppe, C., Enríquez Rocha, P., Petersen, J.L., Rangel Salazar, J.L., Segars, K.P., Wood, K.L. & Marks, J.S. (2019). Typical Owls. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.</ref> Despite having no published weights for adults, Père David's owl (Strix davidi) seems to also be of a similar size to the Ural owl as well. Among standard measurements, in both sexes, wing chord can measure from across the range and tail length can from . Among extant owls, only the great grey owl is certain to have a longer tail. Though less frequently measured, the tarsus may range from and, in northern Europe, the total bill length measured from .Buturlin, S.A. (1907). Die paläarktischen Formen vor Syrnium Savign. Journal für Ornithologie, 55: 332-336. The foot span can regularly reach around in full-grown owls. Vocalizations and ear morphology The song of the male is a deep rhythmic series of notes with a short pause after the first two notes, variously transcribed as wihu huw-huhuwo or huow-huow-huow. The phrase repeats at intervals of several seconds. The male’s song may carry up to to human perception but usually is considered not quite that far-carrying. Peak singing times in Finland during springtime are 10 pm-12 am and more intensely at 1-3 am, which differed from the peak times for nest visits. The female has a similar but hoarser and slightly higher pitched song, giving it a more "barking" quality. Not infrequently, Ural owls will duet during courtship. In addition, a deep, hoarse heron-like kuwat or korrwick is probably used as a contact call. These are more elongated and harsher than the kewick note made by tawny owls (Strix aluco). Young beg with hoarse chrrreh calls, again similar to the ones by young tawny owls but deeper. Vocal behavior tends to peak in early spring until the young leave the nest, most often during incubation and nesting in the form of prey delivery countercalling. The alarm call, which is typically delivered during territorial rounds, of the male is coincidentally analogous to the territorial song of the short-eared owl (Asio flammeus), which is considered a somewhat hollow sounding hoot. The alarm call is audible at up to away. The Ural owl also has