Claire Simpson

Claire Simpson

Claire Simpson
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Pacific walrus travel according to the movement of the ice. As the ice expands in the winter, they move south. As it breaks up and retreats in the spring and summer, they move north again.

Pacific walruses travel according to the movement of the ice. As the ice expands in the winter, the walruses move south. As it breaks up and retreats in the spring and summer, they move north again.

The white pelican breeds in North America and migrates south in the winter to coasts as far as Central America in flocks of up to 180 individuals.

Pictured in the Upper Mississippi River Valley, the white pelican breeds in North America and then migrates south in the winter. The white pelican takes flight to coasts as far as Central America in flocks of up to 180 individuals.

Nearly 40 feet long and weighing up to 20 tons, the mysterious whale shark is the largest fish in the sea. Ironically, its survival depends on some of the tiniest creatures. Whale sharks feed on plankton and also congregate during snapper spawning in order to feed on the fish eggs.

Nearly 40 feet long and weighing up to 20 tons, the mysterious whale shark is the largest fish in the sea. Ironically, its survival depends .

Long thought of as a terror of the shallowest waters, the great white shark is really one of the world's greatest migrants. Its movements cover thousands of miles of open ocean each year from Hawaii to northern Mexico to reach an abundant feast 150 miles off the coast of Guadalupe, Mexico.

Long thought of as a terror of the shallowest waters, the great white shark is really one of the world's greatest migrants. Its movements co.

The zebra migrations in Botswana  filmed by National Geographic Explorers-in-Residence Dereck and Beverly Joubert  see zebra family groups joining together to make the hazardous round trip, a journey that can take a toll on young mothers.

The zebra migrations in Botswana filmed by National Geographic Explorers-in-Residence Dereck and Beverly Joubert see zebra family groups joining together to make the hazardous round trip, a journey that can take a toll on young mothers.

The rare Mali elephant undertakes the longest elephant migration on earth  a 300-mile circle around the heart of landlocked Mali in West Africa. Traversing the southern edge of the Sahara Desert, the only way to survive is to keep moving across the scorched earth  from water to water, food to food  both in desperately short supply.

Sahara Desert: The rare Mali elephant undertakes the longest elephant migration on earth – a circle around the heart of landlocked Mali in West Africa. Traversing the southern edge of the Sahara Desert.

Beginning their journey off the Alaskan coast, the Pacific walrus  whose bodies are not made for swimming long distances  have used ice floes for eons as sanctuaries for rest and breeding as they journey to Russia and back. But in recent years the floating ice chunks have become fewer, smaller and unable to sustain the walrus population that struggles to occupy these insufficient life rafts.

Walruses, Svalbard Tusks of all lengths suggest a mix of ages among these walruses, part of Svalbard's peak summer count of some By the early ivory hunters had nearly wiped out Norway's herds. Protected since the population is still recovering.

No single monarch butterfly completes its migration from Mexico to as far north as Canada and back. Instead, generations of monarchs make this journey  born into a relay race no one butterfly finishes.

No single monarch butterfly completes its migration from Mexico to as far north as Canada and back. Instead, generations of monarchs make this journey born into a relay race no one butterfly finishes.

Decimated by predators and dogged by the whims of the weather, each year 50 million red crabs scamper over jagged cliffs and sunbaked sands to the water's edge  the spawning grounds.

Decimated by predators and dogged by the whims of the weather, each year 50 million red crabs scamper over jagged cliffs and sunbaked sands to the water's edge the spawning grounds.

The black-browed albatross soars in on its 8-foot wingspan to mate on land, all under the hungry gaze of a predator bird, the striated caracara, who has waited through a brutal winter for this bounty of newly laid eggs, hatchlings and chicks. The mother albatross waits on land for the male to fly out to sea for a few days to feed and return to land, heavy with fish for his young chick.

The black-browed albatross soars in on its wingspan to mate on land, all under the hungry gaze of a predator bird, the striated caracara, who has waited through a brutal winter for this bounty of newly laid eggs, hatchlings and chicks.

White-bearded wildebeest herd: Every year, more than a million wildebeest and two hundred thousand zebras must chase the seasonal rains, in a 300-mile loop around Tanzania and Kenya.

Born to Move: Africa - Credit: Anup Shah White-bearded wildebeest herd: Every year, more than a million wildebeest and two hundred thousand zebras must chase the seasonal rains, in a loop around Tanzania and Kenya.