Danny Green / Ringed seal (Pusa hispida) and pup resting on ice. Svalbard, Norway. April.

Danny Green / Ringed seal (Pusa hispida) resting on ice, reflected in water. Svalbard, Norway. July.

Sven Zacek / Bearded seal (Erignathus barbatus) sunbathing on iceberg broken off from glacier. Kongsfjorden fjord, Spitsbergen, Norway. June 2014.

Ashley Cooper / Leopard seal (Hydrurga leptonyx) hauled out on an iceberg in the Drygalski Fjord, Antarctic Peninsula.

Ashley Cooper / Leopard seal (Hydrurga leptonyx) hauled out on an iceberg in the Drygalski Fjord, Antarctic Peninsula.

Ashley Cooper / Leopard seal (Hydrurga leptonyx) hauled out on an iceberg in the Drygalski Fjord, Antarctic Peninsula.

Ashley Cooper / Seal skins hanging up to dry in Ilulissat, Greenland, July 2008.

Danny Green / Ringed seal resting (Phoca hispida) hauled out, Svalbard, Norway, April

Danny Green / Ringed seal and pup (Phoca hispida) Svalbard, Norway, April

Danny Green / Ringed seal pup resting (Phoca hispida) Svalbard, Norway, April

Danny Green / Ringed seal (Phoca hispida) female hauled out with pup, Svalbard, Norway, April

Espen Bergersen / Ringed seal (Pusa hispida) by 'escape' hole in the sea ice. Tempelfjorden, Svalbard, Norway. April