Richard Du Toit / Aerial photograph of container ship near Cape Town Harbour, Atlantic Ocean, South Africa, Western Cape Province, March 2010

Piper Mackay / Container freighter travelling through the Panama canal, Panama, November 2008

Andy Rouse / Expedition ship M/S Stockholm, Svalbard, July.

Magnus Lundgren / Wild Wonders of China / Indo-Pacific humpback dolphin, (Sousa chinensis) surfacing, with industrial ship in the background, Tai O, Lantau Island, Hong Kong, China

Magnus Lundgren / Wild Wonders of China / Indo-Pacific humpback dolphin (Sousa chinensis) with ship in the background, Tai O, Lantau Island, Hong Kong, China.

Richard Robinson / Bottlenose dolphins (Tursiops truncatus) ride the bow of a logging ship, Northern New Zealand Editorial use only.

Michel Roggo / Ship on the main channel of the Danube river, the Bratul Sulina, at Crisan, Danube Delta Biosphere Reserve, UNESCO World Heritage Site, May 2014 . Photographed for The Freshwater Project

Michel Roggo / Ship on the main channel of the Danube river, the Bratul Sulina, at Crisan Danube Delta Biosphere Reserve, Romania, May 2014 . Photographed for The Freshwater Project

Tony Wu / Carcass of a female Bryde's whale (Balaenoptera edeni brydei) carried into port on the bow of a ship. Laem Chabang Port, Thailand.

Mark Carwardine / Aerial view of Minerva Virgo oil tanker / chemical tanker sailing along coastal waters, Louisiana, Gulf of Mexico, USA, August 2010

SCOTLAND: The Big Picture / Bottlenose dolphin (Tursiops truncatus) bow riding a ship, Moray Firth, Inverness, Scotland, UK, July 2014.

Pete Oxford / Aerial view of Linden town, Guyana, South America