Ural owl
The ears of the Ural owl are quite large, averaging about on the left and on the right with the pre-aural dermal flap measuring about . In fact their ears are amongst the largest recorded in owls. In combination with their large ears, the well-developed facial disc shows the importance of sound to hunting to this and other owl who hunt in boreal zones. While the Ural owl was found to be aurally overdeveloped compared to other "Strix" such as the barred owl ("Strix varia") it was found to be underdeveloped in comparison to owls more confined to true boreal type habitats, like the great grey owl and the boreal owl ("Aegolius funereus").