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

A confusion of blue wildebeest (Connochaetes taurinus), on the Great Migration, Serengeti National Park, Tanzania, East Africa, Africa

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

A confusion of blue wildebeest (Connochaetes taurinus), on the Great Migration, Serengeti National Park, Tanzania, East Africa, Africa

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

Wildebeest (Connochaetes taurinus), Masai Mara, Kenya, East Africa, Africa

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

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

Silhouetted Sandhill Crane (Grus canadensis) in flight at sunset, Bernardo Wildlife Area, Ladd S. Gordon Wildlife Complex, New Mexico, United States of America, North America

Wildebeest crossing Mara River during annual migration, Masai Mara, Kenya, East Africa, Africa

Sandhill crane migration, Platte River, Nebraska, United States of America, North America

Public garden commemorating first migrants who reached Israel by sea, with memorial in shape of a boat and David tower in the background, London Square, Jaffa, Tel Aviv, Israel, Middle East

Migration of the Qashgai tribe, Iran, Middle East

Kuchie nomad camel train, between Chakhcharan and Jam, Afghanistan, Asia

Baluchi nomads, Bolan Pass, Baluchistan, Pakistan, Asia

Baluchi nomads, Bolan Pass, Baluchistan, Pakistan, Asia

Summer migration of Kazaks, Altay Mountains, northeast Xinjiang, China, Asia

Summer migration of Kazaks, Altay Mountains, northeast Xinjiang, China, Asia

Spanish seasonal workers grape picking, Seguret, Vaucluse region, Provence, France, Europe

Kuchi nomads, Afghanistan, Asia

Three swallows perching, bird on the wire, in County Clare, West of Ireland

Brent geese, Branta (bernicla) bernicla, in the saltmarshes in Holkham, North Norfolk, UK

Brent geese, Branta (bernicla) bernicla, in the saltmarshes in Holkham, North Norfolk, UK

Pink-footed geese in the sky at sunset over Holkham saltmarshes, North Norfolk, UK

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)

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

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

Starlings, Queensland, Australia. Avian Flu Bird Flu virus could spread to wild birds

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.

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

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.

Starlings, Queensland, Australia. Avian Flu Bird Flu virus could spread to wild birds

Spotted Flycatcher bird with a fly in its beak on a branch in Oxfordshire, England

Migrating Blue Wildebeest running to catch up the herd,Grumeti,Tanzania

Nomadic transhumance with bactrian camels in winter landscape, Province of Khovd, Mongolia, Central Asia, Asia

Nomadic transhumance with bactrian camels in snow covered winter landscape, Province of Khovd, Mongolia, Central Asia, Asia

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

Bridge over the Rio Grande on the border of Mexico at Nuevo Laredo and the U.S.A. at Laredo, Texas, United States of America, North America

Ghetto on main road, Iraklion, Crete, Greek Islands, Greece, Europe

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

Wildebeest migration trail, Grumeti, Tanzania

Spotted Flycatcher bird, with a wasp in its beak, on a branch in Oxfordshire, England

Pink-footed geese in the sky at sunset at Burnham Thorpe near Holkham, North Norfolk, UK

Hyde Park Barracks, originally an Immigration Depot for single female immigrants seeking work as domestic servants, Sydney, New South Wales, Australia, Pacific

Pink-footed geese in the sky at sunset over Holkham saltmarshes, North Norfolk, UK

Migration of butterflies, Chimmini Sactuary, Thrissur, Kerala, India, Asia

Humpback Whales (Megaptera novaeangliae) feeding on Krill in Wilhelmena Bay, Antarctic Peninsular and surfacing wth a metre of a zodiak. The whales migrate here in the summer to feed on the Krill. Krill numbers have declined by over 50%. They feed on algae that grows on the underside of sea ice, As the sea ice melts, both algae and krill decline. This shot has penguins resting on an iceberg in the background.

Black Headed Gulls fedding on Seaweed flies that are being flushed out of the seaweed on the strand line at high tide, at Boulmer, Northumberland, UK.

On Friday 11th July 2014, the Young Ospreys that nest on Bassenthwaite in the Lake District National Park, Cumbria, UK, are ringed and fitted with a satelite tracker. they are ringed by Pete Davis, a licensed bird ringer, and the satelite tracker is fitred by Roy Dennis. Roy is theonly person in the UK, licensed to fit satelite trackers to birds of prey. The tracing is part of the Bassenthwaite Osprey project, to see whereabouts in Africa the young migrate to, before returning hopefully to the UK to nest.Ospreys recolonized the Lake district in 2001, after an absence ovf over 150 years. In the last fourteen years of breeding over half a million people have visited the project to view these spectacular fish eating birds.

On Friday 11th July 2014, the Young Ospreys that nest on Bassenthwaite in the Lake District National Park, Cumbria, UK, are ringed and fitted with a satelite tracker. they are ringed by Pete Davis, a licensed bird ringer, and the satelite tracker is fitred by Roy Dennis. Roy is theonly person in the UK, licensed to fit satelite trackers to birds of prey. The tracing is part of the Bassenthwaite Osprey project, to see whereabouts in Africa the young migrate to, before returning hopefully to the UK to nest.Ospreys recolonized the Lake district in 2001, after an absence ovf over 150 years. In the last fourteen years of breeding over half a million people have visited the project to view these spectacular fish eating birds.

On Friday 11th July 2014, the Young Ospreys that nest on Bassenthwaite in the Lake District National Park, Cumbria, UK, are ringed and fitted with a satelite tracker. they are ringed by Pete Davis, a licensed bird ringer, and the satelite tracker is fitred by Roy Dennis. Roy is theonly person in the UK, licensed to fit satelite trackers to birds of prey. The tracing is part of the Bassenthwaite Osprey project, to see whereabouts in Africa the young migrate to, before returning hopefully to the UK to nest.Ospreys recolonized the Lake district in 2001, after an absence ovf over 150 years. In the last fourteen years of breeding over half a million people have visited the project to view these spectacular fish eating birds.

On Friday 11th July 2014, the Young Ospreys that nest on Bassenthwaite in the Lake District National Park, Cumbria, UK, are ringed and fitted with a satelite tracker. they are ringed by Pete Davis, a licensed bird ringer, and the satelite tracker is fitred by Roy Dennis. Roy is theonly person in the UK, licensed to fit satelite trackers to birds of prey. The tracing is part of the Bassenthwaite Osprey project, to see whereabouts in Africa the young migrate to, before returning hopefully to the UK to nest.Ospreys recolonized the Lake district in 2001, after an absence ovf over 150 years. In the last fourteen years of breeding over half a million people have visited the project to view these spectacular fish eating birds.

Humpback Whales (Megaptera novaeangliae) feeding on Krill in Wilhelmena Bay, Antarctic Peninsular. The whales migrate here in the summer to feed on the Krill. Krill numbers have declined by over 50%. They feed on algae that grows on the underside of sea ice, As the sea ice melts, both algae and krill decline. An expedition cruise ship in the background

Humpback Whales (Megaptera novaeangliae) feeding on Krill in Wilhelmena Bay, Antarctic Peninsular. With passengers from an expedition crusie in Zodiaks. The whales migrate here in the summer to feed on the Krill. Krill numbers have declined by over 50%. They feed on algae that grows on the underside of sea ice, As the sea ice melts, both algae and krill decline.

Humpback Whales (Megaptera novaeangliae) feeding on Krill in Wilhelmena Bay, Antarctic Peninsular. The whales migrate here in the summer to feed on the Krill. Krill numbers have declined by over 50%. They feed on algae that grows on the underside of sea ice, As the sea ice melts, both algae and krill decline.

Red Knot, (Calidris canutus) flocking on salt marsh on morecambe Bay, Cumbria, UK, a high tide.

A juvenile Arctic Skua (Stercorarius parasiticus) on the coast in Northumberland, UK

An Arctic Tern, Sterna paradisaea, that has been ringed, on Inner Farne, on the Farnes Islands, off Seahouses in Northumberland, UK.

Village life, paraguay. Near the paraguay-brazil border. A family of german people who have settled in the area

Greylag Goose (Anser anser) in flight, Slimbridge, UK

Usa murals depicting migration and contrast between north and south, el paso, texas

Greater flamingos (Phoenicopterus roseus), three adults land to join many others and roosting Avocets (Recurvirostra avocetta) on Kallini salt pans during the autumn migration period, Isle of Lesbos (Lesvos), Greece.

California Gray Whale (Eschrichtius robustus) mother and calf in the calm waters of San Ignacio Lagoon, Baja, Mexico.

Beached California Gray Whale (Eschrichtius robustus) calf with Turkey Buzzards feeding on carcass on Isla Tiburon in the Gulf of California (Sea of Cortez), Mexico.

Adult California Gray Whale (Eschrichtius robustus) carcass on Isla Tiburon, Sonora, Mexico.

Beached California Gray Whale (Eschrichtius robustus) calf stranded by gill net around flukes on Isla Tiburon in the Gulf of California (Sea of Cortez), Mexico.

Curious California Gray Whale (Eschrichtius robustus) mother and calf approach boat in the calm waters of San Ignacio Lagoon, Baja, Mexico. (Restricted Resoluion - pls contact us)

California Gray Whale (Eschrichtius robustus) calf underwater in San Ignacio Lagoon, Baja, Mexico.

California Gray Whale (Eschrichtius robustus) mother being touched underwater in the calm waters of San Ignacio Lagoon, Baja, Mexico. (Restricted Resoluion - pls contact us)

Adult California gray whale (Eschrichtius robustus) surfacing (note barnacles and whale lice) in the calm waters of Magdalena Bay, Baja California Sur, Mexico.

California gray whale (Eschrichtius robustus) calf surfacing in the calm waters of Magdalena Bay, Baja California Sur, Mexico.

Adult bull California Gray Whale (Eschrichtius robustus) penis display (courtship behaviour) in the calm waters of San Ignacio Lagoon, Baja, Mexico. (Restricted Resolution - pls contact us)

Adult California Gray Whale (Eschrichtius robustus) baleen (detail showing exterior side) on Isla Tiburon in the Gulf of California (Sea of Cortez), Mexico.

Curious California Gray Whale (Eschrichtius robustus) calf approaches boat in the calm waters of San Ignacio Lagoon, Baja, Mexico. (Restricted Resoluion - pls contact us)

Leucistic Antarctic Fur Seal pup, Arctocephalus gazella, amongst normally coloured animals, South Georgia, South Atlantic Ocean. Leucism is a general term for the phenotype resulting from defects in pigment cell differentiation and/or migration from the neural crest to skin, hair or feathers . This results in either the entire surface or patches of the body surface having a lack of cells capable of making pigment.

Camerman Peter Scoones filming Grey whale (Eschrichtius robustus) underwater with remote camera, San Ignacio lagoon, Baja California, Mexico

The Indian summer colours the tree line along the coast indicating the oncoming winter. A sign that Minke whales (Balaenoptera acutorostrata) should start their migration south to unknown waters. St. Lawrence estuary, Canada

Adult California Gray Whale (Eschrichtius robustus) fluke-up dive - note extreme scarring and damage to right fluke - in Bahia Magdalena on the Pacific side of the Baja Penninsula. Pacific Ocean.

Leucistic Antarctic Fur Seal pup, Arctocephalus gazella, South Georgia, South Atlantic Ocean. Leucism is a general term for the phenotype resulting from defects in pigment cell differentiation and/or migration from the neural crest to skin, hair or feathers . This results in either the entire body surface or patches of the body surface having a lack of cells capable of making pigment.

Canadian Snow Goose Migration, Chen caerulescens, Canadian Snow Geese, Bosque del Apache, New Mexico

California gray whale (Eschrichtius robustus) calf surfacing in the calm waters of Magdalena Bay, Baja California Sur, Mexico.

Common or Eurasian crane (Grus grus) flocks flying from roost site at sunrise, silhouetted against dawn sky, autumn migration period, Rugen-Bock-Region, Mecklenburg-Vorpommern, Germany.

Adult California Gray Whale (Eschrichtius robustus) spy-hopping in the calm waters of San Ignacio Lagoon, Baja, Mexico.

Beached female California Gray Whale (Eschrichtius robustus) carcass in the calm waters of San Ignacio Lagoon, Baja, Mexico.

Humpback whale (Megaptera novaeangliae) with both pectoral fins in the air in the AuAu Channel, Maui, Hawaii, USA. Pacific Ocean.

California gray whale (Eschrichtius robustus) calf surfacing in the calm waters of Magdalena Bay, Baja California Sur, Mexico.

California Gray Whale (Eschrichtius robustus) spy-hopping near whale watchers in Magdalena Bay along the Pacific side of the Baja Peninsula. Pacific Ocean.

California gray whale (Eschrichtius robustus) calf surfacing in the calm waters of Magdalena Bay, Baja California Sur, Mexico

Juvenile gull landing on the back of a California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon, Baja, Mexico.

Free diving with Atlantic spotted dolphins (Stenella frontalis) in clear waters off Island of Bimini. Here dolphins come to rest and socialist between feeding sessions. Isla

California Gray Whale (Eschrichtius robustus) surfacing near whale watchers in Magdalena Bay along the Pacific side of the Baja Peninsula. Pacific Ocean.

Adult California Gray Whale (Eschrichtius robustus) underwater (eye detail) in the calm waters of San Ignacio Lagoon, Baja, Mexico.

Curious California Gray Whale (Eschrichtius robustus) calf approaches boat (eye detail) in the calm waters of San Ignacio Lagoon, Baja, Mexico.

Grey whale (Eschrichtius robustus) surfacing to blow near boat. Yellowish barnacles and mottled pigmentation typical of this species. Baja California, Mexico

Whooper swans at Martin Mere bird reserve near Ormskirk, Lancashire, England, United Kingdom, Europe

California gray whale (Eschrichtius robustus) calf surfacing (note eye and mouthline) in the calm waters of Magdalena Bay, Baja California Sur, Mexico.