Alex Mustard / Female Grey seal (Halichoerus grypus) tangled in a discarded fishing net, Lundy Island, Devon, England, UK, July 2010.

Ingo Arndt / Leopard Seal (Hydrurga leptonyx) barking, Weddell Sea, Antarctica

Kerstin Hinze / Spotted seal (Phoca largha) resting on ice, Lake Abashiri, Hokkaido, Japan February 2007

Kerstin Hinze / Spotted seal (Phoca largha) resting on ice, Lake Abashiri, Hokkaido, Japan February 2007

Kerstin Hinze / Spotted seal (Phoca largha) resting on ice, Lake Abashiri, Hokkaido, Japan February 2007

Hiroya Minakuchi / Spotted Seal (Phoca largha), Japan

Hiroya Minakuchi / Weddell Seal (Leptonychotes weddellii) resting on ice, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Weddell Seal (Leptonychotes weddellii) resting on ice, Antarctic Peninsula, Antarctica

Ingo Arndt / Grey Seal (Halichoerus grypus), North Sea, Helgoland, Germany

Ingo Arndt / Grey Seal (Halichoerus grypus) scratching on beach, North Sea, Helgoland, Germany

Ingo Arndt / Leopard Seal (Hydrurga leptonyx) on ice, calling, Weddell Sea, Antarctica

Ingo Arndt / Leopard Seal (Hydrurga leptonyx) hauled out on ice, Weddell Sea, Antarctica

Gerry Ellis / Harbor Seal (Phoca vitulina) hauled out on a rock Pacific Coast, North America

Jim Brandenburg / Harbor Seal (Phoca vitulina) portrait

Gerry Ellis / Harbor Seal (Phoca vitulina) resting on rock in water, North Pacific and Atlantic coasts

Michio Hoshino / Spotted Seal (Phoca largha) resting on ice floe, Alaska

Fred Bavendam / Harbor Seal (Phoca vitulina) balancing on rock, Monterey, California

Nature Production / Spotted Seals {Phoca largha} hauled out on ice floe, Off Shiretoko Peninsula, Hokkaido, Japan, February