A member of the United States Naval Academy freshman class wears body armor, helmet and carries a rifle through a mud-filled ditch as part of the “Wet and Sandy” challenge during the rigorous Sea Trials May 17, 2011 in Annapolis, MD. Under strict safety supervision, about 900 freshmen, or “Plebes”, faced 14 hours of 32 rigorous physical and mental challenges during the trials, a daylong, action-oriented event modeled after the Marine Corps 54-hour Crucible and the Navy's Battle Stations. (Photo by Chip Somodevilla/Getty Images)

In this July 12, 2007 file photo, a two-day-old piping plover runs along a beach in the Quonochontaug Conservation Area in Westerly, R.I. (Photo by Steven Senne/AP Photo)

Neil Tuckett and Jamie Davidson, begin their attempt to drive a 1911 Model T Ford to the top of Ben Nevis on May 16,2011 in Fort William, Scotland. The challenge has been organised in memory of a pioneering Edinburgh car dealer Henry Alexander, who drove to the top of Ben Nevis to prove the ruggedness of the Model T. The original accent took five days with the route leading over boulders and through snow drifts. (Photo by Jeff J Mitchell/Getty Images)

Copies of the Unauthorized Autobiography of Wikileaks founder Julian Assange are on display and on sale in Waterstones bookstore on September 22, 2011in Edinburgh, Scotland. The Wikileaks founder has accused publishers Cannongate of a breach of contract after releasing drafts of his autobiography without his approval. (Photo by Jeff J Mitchell/Getty Images)

Members of the public view crosses in Scotland?s first Field of Remembrance in Princess Street Gardens on November 7, 2011 in Edinburgh, Scotland. Volunteers helped plant approximately 11,000 remembrance crosses as a temporary memorial to mark the 90th anniversary of the Scottish Poppy Appeal. (Photo by Jeff J Mitchell/Getty Images)

Duncan Fenton from the Society of William Wallace stands next to a 700-year-old letter believed to have been in the possession of William Wallace, which has returned to National Records of Scotland on January 12, 2012 in Edinburgh, Scotland. (Photo by Jeff J. Mitchell/Getty Images)

The Wildscreen festival is the world’s biggest celebration of screen-based natural history storytelling which takes place every two years in Bristol. Here: “Walrus in Midnight Sun”. Walrus feed mostly on bivalves in productive, shallow and often sandy habitats in the Arctic. This individual, though, arrived on a beach outside Tromsø, northern Norway, and found comfort on a stranded dead sperm whale. After two weeks he approached Audun, and only half a metre away he stretched his tusk forward and touched his hand gently. “This was one of the most memorable moments of my life”, Rikardsen says. He named the 500kg male Buddy. After two months, the dead whale was decomposed and Buddy suddenly disappeared. (Photo by Audun Rikardsen/Wildscreen 2016)

Freya Smith aged three, leads one of Erth’s giant dinosaur puppets across the road on August 6, 2019 in Edinburgh, Scotland. Australian theatre company Erth presents their best-selling show Dinosaur’s Zoo as part of Underbelly’s Fringe programme. Featuring giant dinosaur puppets which walk, roar and blink like the real thing, Dinosaur’s Zoo is a perfect example of edutainment for children of all ages, taking place at the McEwan Hall every day of the Fringe at 11am. (Photo by Jeff J. Mitchell/Getty Images)