Ann & Steve Toon / Arctic tern (Sterna paradisaea) with sandeel. Inner Farne, Northumberland, UK. July.

SCOTLAND: The Big Picture / Atlantic puffin (Fratercula arctica) flapping with sand eels in beak, in evening light, Fair Isle, Shetland, Scotland, UK, June.

Danny Green / Atlantic Puffin (Fratercula arctica) wing stretching with sand eels in beak, Flannan Isles, Scotland, UK, July

Andy Trowbridge / Puffin (Fratercula arctica) in flight, with beak full of sand eels. Fair Island, Shetland Islands, Scotland, July.

Andy Trowbridge / Puffin (Fratercula arctica) standing on Sea thrift (Armeria maritima) with wings out stretched with a beak full of sand eels. Close-up portrait. Fair Island, Shetland Islands, Scotland, July.

Andy Trowbridge / Puffin (Fratercula arctica) sitting on Sea thrift (Armeria maritima) with beak full of sand eels. Close-up portrait. Fair Island, Shetland Islands, Scotland, July.

Andy Trowbridge / Atlantic Puffin (Fratercula arctica) in flight, coming into land with beak full of sand eels (Ammodytes tobianus). Fair Isle, Shetland Islands, Scotland, UK, July.

Richard Steel / 2020VISION / Puffin (Fratercula arctica) with beak full of sandeels, Farne Islands, Northumberland, England, UK, July.

Rob Jordan / 2020VISION / Puffin (Fratercula arctica) with sand eels in beak, Farne Islands, Northumberland, June.

David Tipling / 2020VISION / Arctic Tern (Sterna paradisaea) with sand eel in beak. Farne Islands, Northumberland, July.

Juergen Freund / Clown / Napoleon snake eel (Ophichthus bonaparti) emerging from sand, Batangas, Philippines.

Sue Daly / A shoal of Sand Eels (Ammodytes tobianus) against surface light. Channel Islands, UK, August.

Pete Oxford / Galapagos garden eels (Heteroconger / Taenioconger klausewitzi) on seabed, Galapagos Islands

Andrew Parkinson / Puffin (Fratercula arctica) in flight, preparing to land on cliff top, with beak full of Sand eels (Ammodytes tobianus) Shetland Islands, Scotland, UK, July (non-ex)

Andy Rouse / Puffin (Fratercula arctica) with sand eels for young, Fair Isle, Shetland Islands, UK

Andy Rouse / Puffin (Fratercula arctica) with Sand eels for young, Fair Isle, Shetland Islands, UK

Andy Rouse / Puffin (Fratercula arctica) landing carrying Sand eels in beak, Fair Isle, Shetland Islands, UK

Andy Rouse / Puffin (Fratercula arctica) landing carrying Sand eels, Fair Isle, Shetland Islands, UK

Graham Eaton / Herring Gull (Larus argentatus) feeding on sandeel, underwater shot, Cardigan Bay, Wales, UK, June

Graham Eaton / Arctic Tern (Sterna paradisaea) fishing for sandeel, Anglesey, Wales, UK, July

David Tipling / Atlantic Puffin {Fratercula arctica} with Sandeels in beak, Scotland, UK.

Rolf Nussbaumer / Puffin with sandeel, flapping wings {Fratercula arctica} Norway.

Solvin Zankl / Puffin {Fratercula arctica} landing with sandeels in beak, Orkney, Scotland, UK 2006

David Kjaer / Puffin in flight with sand eels in beak {Fratercula arctica} Farne Is, Northumberland, UK

Pete Oxford / Puffin carrying sand eels in beak (Fratercula arctica) Fair Isle, Shetland Isles Scotland

Pete Oxford / Puffin with sandeels in beak, Fair Isle (Fratercula arctica) UK Scotland

John Cancalosi / Puffin with sandeels. England

David Hall / Brown garden eel (Heteroconger longissimus) living in shallow water colony with others, Dominica, Carribean.

David Fleetham / Reptilian snake eel (Brachysomophis henshawi) half buried in sand, hiding, Hawaii.

Alex Mustard / School of Lesser sand eels (Ammodytes tobianus) swimming over an Eelgrass (Zostera marina) meadow in shallow water. Swanage, Dorset, UK. English Channel. July.

Alex Mustard / Shoal of Lesser sandeels (Ammodytes tobianus) swims through thongweed (Himanthalia elongata) and sunbeams. Falmouth, Cornwall, England, United Kingdom. British Isles. North East Atlantic Ocean.

Alex Mustard / Portrait of a Black saddle snake eel (Ophichthus cephalozona) emerging from the sand at night. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocea...

David Fleetham / Endemic Hawaiian garden eels (Gorgasia hawaiiensis) which retreat into the sand when approached, Maui, Hawaii.

Alex Mustard / Shoal of lesser sandeels ( Ammodytes tobianus) swims through thongweed (Himanthalia elongata) and sunbeams. Falmouth, Cornwall, England, United Kingdom. North East Atlantic Ocean.

Alex Mustard / Shoal of lesser sandeels (Ammodytes tobianus) swims through thongweed (Himanthalia elongata) and sunbeams. Falmouth, Cornwall, England, United Kingdom. North East Atlantic Ocean.

Chris Shields / Illustration of Lesser sandeel (Ammodytes tobianus)

David Hall / Thousands of Pacific Sandlance (Ammodytes hexapterus) swim overhead, as a few rockfish (Sebastes sp.) swim in the distance. Seven Tree Island, Browning Pass, Queen Charlotte Strait, British Columbia,...

Terry Whittaker / Puffin (Fratercula arctica) bringing Lesser sandeels (Ammodytes tobianus) back to burrow. Grimsey Island, Iceland, July

Terry Whittaker / Puffin (Fratercula arctica) bringing lesser sandeels ( Ammodytes tobianus) back to burrow. Grimsey Island, Iceland, July

Terry Whittaker / RF - Razorbill (Alca torda) adult with sandeels. Grimsey Island, Iceland (This image may be licensed either as rights managed or royalty free.)

Terry Whittaker / RF - Puffin (Fratercula arctica) bringing lesser sandeels ( Ammodytes tobianus) back to burrow. Grimsey Island, Iceland, July (This image may be licensed either as rights managed or royalty free.)

David Woodfall / Two little tern (Sterna albifrons), one with sand eel landing at the nest amongst Black Oats growing on shell rich sands Machair , Indicator bird of climate change because of its dependence on sand ee...

David Woodfall / Little tern (Sterna albifrons ) with newly hatched chick, feeding sand eel-Hyperoplus spp.Indicator of climate change as Little terns are only able to feed in top layer of sea water , and as sea warms...

David Woodfall / Little tern chick (Sterna albifrons) four days after hatching, waiting for parents to feed it with sand eels and small fish. County Wicklow, Ireland, June.

David Woodfall / Little tern chick (Sterna albifrons) four days after hatching, waiting for parents to feed it with sand eels and small fish, County Wicklow, Ireland, July.

David Woodfall / Little Tern (Sterna albifrons) arriving at the nest on pebble shingle after fishing for sand eels, County Wicklow, Ireland, June.

David Woodfall / Little Tern (Sterna albifrons) arriving at the nest on pebble shingle after fishing for sand eels, County Wicklow, Ireland, June.

Pascal Kobeh / Henshaw's snake eel (Brachysomophis henshawi) burried in the sand, Sulu sea, Philippines