Sergey Gorshkov / Siberian Tundra Reindeer (Rangifer tarandus sibiricus) herd migrating through snow, Putoransky State Nature Reserve, Putorana Plateau, Siberia, Russia

Sergey Gorshkov / Pacific Walrus (Odobenus rosmarus divergens), Wrangel Island, Russia

Sergey Gorshkov / Snow Goose (Chen caerulescens) group taking flight and calling, Wrangel Island, Russia

Sergey Gorshkov / Snow Goose (Chen caerulescens) pair flying over flock on ground near snowy mountain range, Wrangel Island, Russia

Sergey Gorshkov / Snow Goose (Chen caerulescens) pair courting, Wrangel Island, Russia. Sequence 3 of 4

Sergey Gorshkov / Arctic Fox (Alopex lagopus) chasing Snow Goose (Chen caerulesens) off its nest, Wrangel Island, Russia

Sergey Gorshkov / Polar Bear (Ursus maritimus) mother and cubs in snow, Wrangel Island, Russia. Sequence 1 of 3

Sergey Gorshkov / Muskox (Ovibos moschatus) pair, Wrangel Island, Russia

Sergey Gorshkov / Polar Bear (Ursus maritimus) showing aggression, Wrangel Island, Russia

Sergey Gorshkov / Polar Bear (Ursus maritimus) group scavenging on Pacific Walrus (Odobenus rosmarus divergens) carcass, Wrangel Island, Russia

Sergey Gorshkov / Red Fox (Vulpes vulpes) yawning, Kamchatka, Russia

Sergey Gorshkov / Red Fox (Vulpes vulpes) on snow, Kamchatka, Russia