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Herd of migrating wildebeest (Connochaetes taurinus) crossing Mara River, Masai Mara Game Reserve, Kenya, East Africa, Africa

Herd of migrating wildebeest (Connochaetes taurinus) crossing Mara River, Masai Mara Game Reserve, Kenya, East Africa, Africa

Snow goose (Chen caerulescens) flock at dawn after a blast off, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

Atlantic salmon (Salmo salar) leaping on upstream migration, River Tyne, Hexham, Northumberland, England, United Kingdom, Europe

A young humpback whale, Megaptera novaeangliae, breaches out of the blue waters of the Caribbean Sea.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

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.

Wildebeest migration (Connochaetes taurinus), Masai Mara National Reserve. Kenya, East Africa, Africa

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

Migrating wildebeest (Chonnochaetes tautinus) crossing Lake Ndutu, Serengeti, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Tourist watching wildebeest (Chonnochaetes tautinus), crossing Lake Ndutu, Serengeti, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Sandhill crane (Grus Canadensis) in flight parachuting on approach to landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Snow goose (Chen caerulescens) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Snow goose (Chen caerulescens) flock in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Snow goose (Chen caerulescens) flock in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

A flock of migrating sanderlings (Calidris alba) taking flight on Sand Dollar Beach, Baja California Sur, Mexico, North America

A flock of migrating sanderlings (Calidris alba), Sand Dollar Beach, Baja California Sur, Mexico, North America

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Migrating plains zebras (Equus quagga) and wildebeests (Connochaetes taurinus), crossing Lake Ndutu, Serengeti, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Herd of migrating wildebeest (Connochaetes taurinus) crossing Mara River, Masai Mara Game Reserve, Kenya, East Africa, Africa

Herd of wildebeests (Connochaetes taurinus) migrating under the rain, Masai Mara National Reserve, Kenya, East Africa, Africa

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Herd of migrating wildebeest (Connochaetes taurinus) crossing Mara River, Masai Mara National Reserve, Kenya, East Africa

Wildebeest migration (Connochaetes taurinus), Masai Mara National Reserve. Kenya, East Africa, Africa

Herd of migrating wildebeest (Connochaetes taurinus) crossing Mara River, Masai Mara Game Reserve, Kenya, East Africa, Africa

Herd of migrating wildebeest (Connochaetes taurinus) crossing Mara River, Masai Mara Game Reserve, Kenya, East Africa, Africa

Migrating barchan sand dunes across road marked by buried telegraph poles, Kharga basin, Western Desert, Egypt, North Africa, Africa

Almadraba trapping of migrating Atlantic Bluefin tuna (Thunnus thynnus) dating back to Phoenician times in Andalucia, Spain, Europe

Migratory Starlings on telephone wires at Thames Estuary. Avian Flu (Bird Flu) could be brought to Britain from Europe by migrating birds.

Pink-footed Geese migration, Holkham, Norfolk. Migrating birds could risk Avian Flu (Bird Flu Virus)

Migrating Pink-Footed geese over-wintering at Holkham, North Norfolk coast, East Anglia, Eastern England

Migratory Starlings and wood pigeons at Thames Estuary. Avian Flu (Bird Flu) could be brought to Britain from Europe by migrating birds.

Birdwatchers inside bird hide watch migrating geese over-wintering near Holkham, Norfolk, East Anglia, United Kingdom

Migratory Starlings on telephone wires at Thames Estuary. Avian Flu (Bird Flu) could be brought to Britain from Europe by migrating birds.

Migratory Lapwings and waders at the Thames Estuary. It is feared that Avian Flu (Bird Flu) could be brought to Britain from Europe by migrating birds.

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Pink-footed Geese migration, Holkham, Norfolk. Migrating birds could risk Avian Flu (Bird Flu Virus)

Migrating Pink-Footed geese over-wintering on marshland at Holkham, North Norfolk coast, East Anglia, Eastern England

Migratory Lapwings and waders at Thames Estuary. It is feared that Avian Flu (Bird Flu) could be brought to Britain from Europe by migrating birds.