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South American sea lions (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Argentina, South America

Adult fin whale (Balaenoptera physalus), dorsal fin detail surfacing off Newport Beach, California, United States of America, North America

California gray whale calf (Eschrictius robustus), surfacing in San Ignacio Lagoon, Baja California, Mexico, North America

Galapagos sea lions (Zalophus wollebaeki) hauled out on the beach in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) pup in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Antarctica, Polar Regions

Antarctic fur seal pups (Arctocephalus gazella) mock-fighting on South Georgia, Southern Ocean, Polar Regions

Female southern elephant seal (Mirounga leonina) with newborn pup on the beach in Stromness Bay, South Georgia Island

Adult bull southern elephant seal (Mirounga leonina) flipping sand onto its back to cool off on South Georgia Island, Southern Ocean

Adult female southern elephant seal (Mirounga leonina) flipping sand onto its back to cool off on South Georgia Island, Southern Ocean

Highland cattle in Huisinish (Hushinish), Isle of Harris, Outer Hebrides, Scotland, United Kingdom, Europe

Southern elephant seal (Mirounga leonina) pup, called weaners once their mothers stop nursing, South Georgia Island, Southern Ocean

Male southern elephant seal (Mirounga leonina) pups mock fighting on South Georgia Island, Southern Ocean

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Killer whale female (Orcinus orca), tail-lobbing off Isla San Lorenzo, Baja California, Sea of Cortez, Mexico, North America

California sea lion (Zalophus californianus), porpoising in the water in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

A long-beaked common dolphin pod (Delphinus capensis), traveling off Gorda Banks, Baja California Sur, Mexico, North America

Humpback whale (Megaptera novaeangliae), near tourist boat off San Jose del Cabo, Baja California Sur, Mexico, North America

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding Zodiacs on New Island in the Falkland Islands

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding Zodiacs on New Island in the Falkland Islands

Southern right whale (Eubalaena australis) mother being harassed by kelp gull, near Puerto Pyramides, Argentina

Southern Right Whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

Southern Right Whale (Eubalaena australis) mother and calf being harassed by kelp gull, Peninsula Valdez, Argentina

Southern right whale (Eubalaena australis) mother and calf being harassed by kelp gull, Peninsula Valdez, Argentina

Southern right whale (Eubalaena australis) calf surfacing near Puerto Pyramides, Golfo Nuevo, Peninsula Valdez, Argentina

Southern right whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Northern (Steller) sea lion (Eumetopias jubatus) fishing on the flood tide in Inian Pass, Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

Adult brown bear (Ursus arctos) scratching its back on tree, Brooks River, Katmai National Park, near Bristol Bay, Alaska, United States of America

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

Adult common (northern) minke whale (Balaenoptera acutorostrata) sub-surface feeding in the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus), approaches the ship on Spitsbergen in the Svalbard Archipelago, Norway

Young polar bear (Ursus maritimus), feeding on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen, Svalbard, Norway

Young male polar bear (Ursus maritimus), shaking its fur, feeding on a fin whale carcass in Holmabukta in Svalbard, Norway

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Sea lions (Otaria flavescens) in the Beagle Channel, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

A Florida manatee, Trichechus manatus latirostris, rises to the surface of Crystal River, Florida. This endangered sirenian subspecies migrates to inland rivers during the winter where water temperatures are warmer than the ocean.

Skull of an adult female leopard seal (Hydrurga leptonyx), on display at the Natural History Museum in Stanley, Falkland Islands, South America

Adult bull southern elephant seal (Mirounga leonina), skull on display at the Natural History Museum in Stanley, Falklands, South America

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Adult beachmaster bull southern elephant seal (Mirounga leonina) challenging another male at Gold Harbour, South Georgia, Polar Regions

Hundreds of southern elephant seals (Mirounga leonina) hauled out onto the breeding beach at Gold Harbour, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) challenger bull in the surf at Gold Harbour on South Georgia Island, Polar Regions

Adult humpback whales (Megaptera novaeangliae) flukes-up dive in Snow Pass, Southeast Alaska, Pacific Ocean, United States of America, North America

Northern (Steller) sea lion (Eumetopias jubatus) hauled out in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

Adult bull killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Adult female polar bear (Ursus maritimus) walking on multi-year ice floes in Franz Josef Land, Russia, Arctic Ocean, Eurasia

California sea lions (Zalophus californianus), grouped together on a channel marker off Newport Beach, California, United States of America, North America

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the ice in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Galapagos sea lion mother nursing pup (Zalophus wollebaeki) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Leucistic caused by lack of melanin, or blond Antarctic fur seal pup (Arctocephalus gazella) on South Georgia, Southern Ocean, Polar Regions

Antarctic fur seal pup (Arctocephalus gazella) playing in the kelp on Prion Island in the Bay of Isles on South Georgia, Polar Regions

Leucistic caused by lack of melanin, or blond Antarctic fur seal pup (Arctocephalus gazella) on South Georgia, Polar Regions

Killer whale female calf (Orcinus orca), breaching at sunset off Isla San Jose, Baja California Sur, Sea of Cortez, Mexico, North America

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult male Antarctic fur seal (Arctocephalus gazella) head detail, Antarctica, Southern Ocean, Polar Regions

Crabeater seals (Lobodon carcinophaga) hauled out on ice floe in Neko Harbor near the Antarctic Peninsula, Antarctica, Polar Regions

Humpback whale (Megaptera novaeangliae) flukes-up dive in the Weddell Sea near the Antarctic Peninsula, Antarctica, Polar Regions

South American sea lions (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Argentina, South America

Juvenile humpback whale (Megaptera novaeangliae) breaching near the Antarctic Peninsula, Antarctica, Polar Regions