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.

Olga Kamenskaya / Baikal seals (Pusa sibirica) hauled out on rock. Endemic to Lake Baikal. Russia, May.

Olga Kamenskaya / Young Baikal seal (Pusa sibirica) at breathing hole. Lake Baikal, Russia, April.

Olga Kamenskaya / Young Baikal seal (Pusa sibirica) at breathing hole. Lake Baikal, Russia, April.

Staffan Widstrand / Ringed seal (Pusa hispida) hauled out on rock, Svalbard, Norway

Steven Kazlowski / Aerial view of Ringed seals (Phoca hispida) on multi-layer ice (freshwater pans formed over many years where salt is squeezed out of the ice) with exit hole underneath ocean, Chukchi Sea, 20 miles off...

Wild Wonders of Europe / Liodden / Ringed seal (Pusa hispida) close-up of face, Spitsbergen, Svalbard, Norway, March 2009 WWE OUTDOOR EXHIBITION. WWE BOOK

Mats Forsberg / Ringed seal pup suckling {Phoca hispida} Svalbard, Norway

Doug Allan / Portrait of Ringed seal {Phoca hispida} Lancaster Sound, Canada

Doug Allan / Ringed seal at surface hole in ice {Phoca hispida} Lancaster Sound, Canadian Arctic

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