David Weiller / Aerial tracking shot of locals feeding a juvenile Whale shark (Rhincodon typus) and swimming past a crowd of tourists, Oslob, Philippines, May.

David Weiller / Aerial tracking shot of locals feeding a juvenile Whale shark (Rhincodon typus) and swimming past a crowd of tourists, Oslob, Philippines, May.

Marie Read / Common loon (Gavia immer) adult swimming with a chick resting on its back, Presque Isle County, Michigan, USA, June.

Solvin Zankl / Vampire squid (Vampyroteuthis infernalis) swimming quickly away from camera into the darkness, Benguela Current, Atlantic Ocean, close to Namibia. Found at depths over 500 metres. Controlled Condition...

Solvin Zankl / Cock-eyed squid (Histioteuthis bonnellii) swimming in the darkness, Benguela Current, Atlantic Ocean, close to Namibia. Found at depths of over 1,000 meters. Controlled Conditions.

Noemie Stroh / Napoleon wrasse (Cheilinus undulatus) female swimming through soft coral garden, Daedalus, Red Sea, Egypt, August.

Noemie Stroh / Hawksbill turtle (Eretmochelys imbricata) female swimming above stony coral reef, Elphinstone, Red Sea, Egypt, August.

Brian Bevan / Great crested grebe (Podiceps cristatus) courtship weed dance, Bedfordshire, UK, April.

Kim Taylor / Two Freshwater copepods (Cyclops sp) swimming through pond debris, Surrey, UK, May.

Rose Summers / Eurasian beaver (Castor fiber) swimming over to a willow, it clambers on to a branch before beginning to feed on the surrounding leaves, Devon, England, UK.

Ismaele Tortella / Eurasian otter (Lutra lutra) swimming with snow on its back, calling, Norway

Solvin Zankl / Adult Deepsea pelagic octopod (Vitreledonella richardi) swimming downwards before disappearing into the darkness, Atlantic Ocean, close to Cape Verde. Controlled conditions.

Solvin Zankl / Scaleless black dragonfish (Melanostomias biseriatus) appearing out of the darkness and swimming towards the camera, Atlantic Ocean close to Cape Verde.

Simon Littlejohn / Adult female European otter (Lutra lutra) standing with its pup (approximately 14 weeks old) on the edge of the river, the pup raises its front paws onto mum's neck and the female then heads into the...

Simon Littlejohn / European otter (Lutra lutra) pup standing on small island of vegetation in the middle of the river, awaiting the return of its mother, the female appears behind the pup who then slips into the water t...

John Chan / Group of Brent geese (Branta bernicla) foraging in Eelgrass (Zostera marina) bed, Bolsa Chica Ecological Reserve, Southern California, USA, March.

Brian Bevan / Grass snake (Natrix natrix) sensing with tongue while swimming through duckweed in pond, Bedfordshire, UK, September.

Simon Littlejohn / Two European otters (Lutra lutra) hunting in the River Stour, Dorset, England, UK, May.

Ismaele Tortella / Eurasian otter (Lutra lutra) hunting in a shoal of Atlantic herring (Clupea harengus), northern Norway, March

Fred Olivier / Clark's anemonefish (Amphiprion clarkii) and Three spot damselfish (Dascyllus trimaculatus) swimming around anemone (Stichodactyla), Nusatupe Lagoon, Solomon Islands.

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boat and large numbers of...

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boats and large numbers o...

Espen Bergersen / Aerial shot of fishing boats catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) swimming around the boats, Troms, Norway, January.

Espen Bergersen / Aerial shot of two Killer whales (Orcinus orca) swimming inside a shoal of Atlantic herring (Clupea harenguis), hunting, with one Killer whale tail slapping to stun the Herring, Sommaroy, Troms, Norwa...

Espen Bergersen / Aerial shot of two Killer whales (Orcinus orca) swimming into a huge shoal of Atlantic herring (Clupea harenguis), hunting, Sommaroy, Troms, Norway, January.

Espen Bergersen / Aerial shot of two Killer whales (Orcinus orca) swimming near to a huge shoal of Atlantic herring (Clupea harenguis), hunting, Sommaroy, Troms, Norway, January.

Espen Bergersen / Aerial shot of two Killer whales (Orcinus orca) swimming inside a shoal of Atlantic herring (Clupea harenguis), hunting, Sommaroy, Troms, Norway, January.

Espen Bergersen / Aerial shot of two Killer whales (Orcinus orca) swimming inside a large shoal of Atlantic herring (Clupea harenguis), hunting, Sommaroy, Troms, Norway, January.

Espen Bergersen / Aerial shot of three Killer whales (Orcinus orca) swimming close to the surface, Troms, Norway, August.

Espen Bergersen / Aerial shot of a fishing boat with net full of Atlantic herring (Clupea harengus), with Killer whales (Orcinus orca) swimming around the outside, Skjervoy, Troms, Norway, November.

Espen Bergersen / Aerial shot of a pod of Killer whales (Orcinus orca) swimming near the surface, Troms, Norway, October.

Espen Bergersen / Aerial shot of Humpback whales (Megaptera novaeangliae) lunge feeding in a shoal of Atlantic herring (Clupea harengus), Troms, Norway, January.

Espen Bergersen / Aerial shot of three Humpback whales (Megaptera novaeangliae) swimming into a shoal of Atlantic herring (Clupea harengus), preparing to lunge feed, Troms, Norway, January.

Espen Bergersen / Aerial shot of four Humpback whales (Megaptera novaeangliae) swimming near to a shoal of Atlantic herring (Clupea harengus), Troms, Norway, January.

Espen Bergersen / Aerial shot of a Humpback whale (Megaptera novaeangliae) swimming showing belly, Troms, Norway, January.