Canada (NB), China (mainland), Estonia (B) (NB), Finland (B) (NB), Kazakhstan, Kyrgyzstan (B) (NB), Latvia (E) (B), Mongolia (B), North Korea, Norway (B), Russia (Asian) (B), Russia (Central Asian) (B) (NB), Russia (European) (B) (NB), Sweden (B) (NB), USA (B).
Northern Hawk-Owl (Surnia ulula) [XC423747]
by from Boden, Boden Municipality, Norrbottens l\u00e4n, Sweden (begging call)
Northern Hawk-Owl (Surnia ulula) [XC622040]
by Lars Edenius from Norrt\u00e4lje Municipality, Stockholms l\u00e4n, Sweden (alarm call, nocturnal flight call)
Subspecies
Siberian populations, formerly separated as pallasi, included in nominate.
The following 3 subspecies are recognised:
ulula (Linnaeus, 1758) - Northern Eurasia east to Kamchatka and Sakhalin, central Siberia south to Tarbagatay.
tianschanica Smallbones, 1906 - Central Asia and north-western and north-eastern China, possibly also northern Mongolia.
caparoch (Müller, PLS, 1776) - Alaska through Canada to Newfoundland, south to extreme northern USA.