Danny Green / Arctic fox (Alopex lagopus) following scent, in winter pelage. Svalbard, Norway. April.

Danny Green / Arctic fox (Alopex lagopus) in snow. Svalbard, Norway. April.

Mitsuaki Iwago / Arctic Tern (Sterna paradisaea) flying overhead, Arctic

Flip Nicklin / Ringed Seal (Phoca hispida) at breathing hole, Arctic

Norbert Wu / Ctenophore (Beroe cucumis) voracious, large mouth, Arctic

Tony Wu / Atlantic walrus (Odobenus rosmarus rosmarus), two hauled out on ice. Svalbard, Norway. July.

Ingrid Visser / Black Guillemot (Cepphus grylle) resting on rocks, Arctic

Flip Nicklin / Arctic Copepod group swimming, Arctic

Flip Nicklin / Inuit guide and film crew ferrying supplies and snowmobiles on icefloe, Arctic

Flip Nicklin / Bioluminescent zooplankton, Arctic

Flip Nicklin / Bioluminescent zooplankton, Arctic

Norbert Wu / Lion's Mane (Cyanea capillata) jellyfish bell can reach three meters in diameter and weigh one ton, Arctic