Tony Wu / Ural owl (Strix uralensis japonica) resting in hole in tree. Hokkaido, Japan. March.

Tony Wu / Ural owl (Strix uralensis japonica), portrait. Hokkaido, Japan. April.

Aflo / Four Ezo / Japanese ural owls (Strix uralensis japonica) sleeping on a branch, Mikasa, Hokkaido, Japan

Aflo / Ezo / Japanese ural owl (Strix uralensis japonica) sleeping in tree hollow, Mikasa, Hokkaido, Japan

Aflo / Ezo / Japanese ural owl (Strix uralensis japonica) sleeping in tree hollow, Mikasa, Hokkaido, Japan

Aflo / Ezo / Japanese ural owl (Strix uralensis japonica) sleeping in tree hollow, Shibecha City, Hokkaido, Japan

Aflo / Ezo / Japanese ural owl (Strix uralensis japonica) in tree hollow, winter, Shibecha City, Hokkaido, Japan

Nature Production / Ural Owl {Strix uralensis japonica} in hole in tree trunk, Sapporo, Hokkaido, Japan, December

Nature Production / Ural Owl fledglings {Strix uralensis japonica} Hokkaido, Japan

Nature Production / Ural Owl {Strix uralensis japonica} yawning in tree hollow, Hokkaido, Japan

Tony Wu / Pair of Ural owls (Strix uralensis japonica) with male grooming female. Hokkaido, Japan. February.

Tony Wu / Pair of Ural owls (Strix uralensis japonica) in snowfall, with female perched at edge of nest entrance. Hokkaido, Japan. February.