Chadden Hunter / King penguins (Aptenodytes patagonicus) heading out to sea, crossing tidal surf to feed in the open seas, South Georgia. Taken on location for BBC Frozen Planet series, 2008

Philip Stephen / Fishing vessel "Harvester" heading to North Sea fishing grounds in stormy weather. Europe, November 2010. Property released.

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) hatchling trio entering sea, Huon Gulf, Papua New Guinea

Mark MacEwen / Green Sea Turtle (Chelonia mydas) hatchling, heading out to sea, Raine Island, Great Barrier Reef, Australia. Raine Island is the largest and most important green sea turtle nesting area in the world,...

Mark MacEwen / Green Sea Turtle (Chelonia mydas) hatchling, heading out to sea, Raine Island, Great Barrier Reef, Australia. Raine Island is the largest and most important green sea turtle nesting area in the world,...

Mark MacEwen / Green Sea Turtle (Chelonia mydas) hatchling, heading out to sea, Raine Island, Great Barrier Reef, Australia. Raine Island is the largest and most important green sea turtle nesting area in the world,...

Rob Jordan / 2020VISION / Tourists on tour boat heading out to the Farne Islands from Seahouses Harbour, Northumberland

Brent Stephenson / Fiordland crested penguin (Eudyptes pachyrhynchus) on rocks heading back to the sea, Jackson Bay, West Coast, New Zealand, February.

Brent Stephenson / Fiordland crested penguin (Eudyptes pachyrhynchus) crosses the road heading back to sea, Jackson Bay, West Coast, New Zealand, February.

Philip Stephen / Fishing vessel in heavy seas, heading back to port for fish auction. North Sea, 2008. Property released.

Konrad Wothe / Loggerhead Sea Turtle (Caretta caretta) hatchlings heading to sea, Lykia, Turkey

Konrad Wothe / Loggerhead Sea Turtle (Caretta caretta) hatchling heading to sea, Lykia, Turkey

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) heading back to colony from the sea, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Bryan and Cherry Alexander / Gentoo penguins (Pygoscelis papua) heading out to sea to feed. The Neck, Saunders Island, Falkland Islands.

Juergen Freund / Baby Leatherback turtle (Dermochelys coriacea) heading quickly to the sea after hatching. Warmamedi beach, Bird's Head Peninsula, West Papua, Indonesia, July 2009

Nick Upton / Small traditional fishing boat heading out to sea from Skala Sikaminia harbour. Lesbos / Lesvos, Greece, August 2010

Nick Upton / Fishing trawler heading out to sea from Padstow, Cornwall, UK.

Juergen Freund / Woman Tourist watching baby Hawksbill sea turtle {Eretmochelys imbricata} leaving nest and heading to the sea. Lankayan Island, Sabah, Malaysia

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) hatchling entering ocean, Huon Gulf, Papua New Guinea

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) hatchling on sand, Huon Gulf, Papua New Guinea

Daniel Gomez / Sea turtle hatchling heading for the sea, Sian Ka'an Biosphere Reserve Mexico.

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) hatchling trio heading to sea, Huon Gulf, Papua New Guinea

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) hatchling trio heading to sea, Huon Gulf, Papua New Guinea

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) heading to sea, Huon Gulf, Papua New Guinea

Claus Meyer / South American River Turtle (Podocnemis expansa) young turtles racing to the water, Amazon, Brazil

Philip Stephen / Peterhead-registered trawler "Saggitarius" heading for the fish market to auction a catch of langoustine, North Sea. March 2005.

Philip Stephen / Fishing vessel "Carisanne" heading into Peterhead, Scotland to discharge a catch of cod and haddock from the North Sea. July 2007.

Onne van der Wal / A large sport fishing boat heading out to sea from Key West, Florida Keys, Florida, USA.

Flip de Nooyer / King Penguin (Aptenodytes patagonicus) group heading to sea, St Andrews Bay, South Georgia Island

Mike Parry / Leatherback Sea Turtle (Dermochelys coriacea) hatchling entering sea, Huon Gulf, Papua New Guinea