Peter Cairns / 2020VISION / Grey seal (Halichoerus grypus) on haul out in fishing harbour with ferry in the background, Shetland Isles, Scotland, UK, June 2010

Peter Cairns / 2020VISION / Grey seals (Halichoerus grypus) on haul out in fishing harbour with ferry in the background, Lerwick, Shetland Isles, Scotland, UK, June 2010

Peter Cairns / 2020VISION / Grey seal (Halichoerus grypus) bull with reflections on water of harbour lights, Shetland Isles, Scotland, UK, June 2010. Photographer quote: 'This 'seal on fire' is actually bobbing in a harbour and...

Juergen Freund / Large catch of Mackerel scads (Decapterus macarellus) spread out to dry in the sun, Indonesia, August 2009

Juergen Freund / Large catch of Mackerel scads (Decapterus macarellus) spread out to dry in the sun, Indonesia, August 2009

Ross Hoddinott / View of Salcombe and harbour from Snapes Point in the early morning light. Salcombe, South Devon, UK, September 2010

Philip Stephen / Fishing vessel "Ocean Pioneer" nearing Fraserburgh Harbour, with waves crashing against the harbour wall. Scotland, February 2011.

Juan Carlos Munoz / Catch of lobsters being unloaded in the fishing village of Kalk Bay, False Bay, South Africa

Gerrit Vyn / Western Sandpipers (Calidris mauri) and Dunlin (Calidris alpina) roosting during spring migration. Gray's Harbor County, Washington, USA, April.

Russell Cooper / Avocets (Recurvirostra avosetta) and Black Tailed Godwits (Limosa limosa) on the lagoon at Brownsea Island, Poole Harbour, Dorset, England, UK, October 2009.

Miles Barton / Dubai harbour and city with skyscrapers under construction, Dubai, United Arab Emirates, February 2010

Angelo Gandolfi / Backpacker about to board a hydrofoil, Parque Nacional de las Islas Atlantica (Atlantic Islands National Park). Galicia, Spain. July 2008.