The fourth annual BigPicture Natural World Photography Competition aims to celebrate the diversity of life on Earth, and encourages people to protect and conserve it. Here: “The Salmon Catchers”. Terrestrial Wildlife. To capture this view of a mother grizzly bear and her cub, photographer Peter Mather set up a camera trap on a log that he knew the bears tended to traverse while fishing for salmon, in the Yukon River watershed in Canada. (Photo by Peter Mather/BigPicture Natural World Photography Competition 2017)

Some wave over the rainbow – a splash of colour is captured in spray over the sea wall at Totland Bay on the Isle of Wight off the south coast of England on February 16, 2022. (Photo by Jamie Russell/Bournemouth News)

An observer watches the Perseid meteor shower at Mount Hamilton in California, United States on August 13, 2023. (Photo by Tayfun Coskun/Anadolu Agency via Getty Images)

A staff of the Beijing 2022 Winter Olympic Games holds a placard reading “Mask on” as USA's players react after their defeat in the women's gold medal match of the Beijing 2022 Winter Olympic Games ice hockey competition between Canada and USA, at the Wukesong Sports Centre in Beijing on February 17, 2022. (Photo by Kirill Kudryavtsev/AFP Photo)

England supporters celebrate England's penalty and second goal as they watch the UEFA EURO 2020 semi-final football match between England and Denmark, at the 4TheFans Fan Park in Manchester, northwest England on July 7, 2021. (Photo by Oli Scarff/AFP Photo)

France's Ian Jason is tackled by Japan's Mei Ohtani during the first day of the Hong Kong Sevens rugby tournament in Hong Kong, Friday, March 31, 2023. (Photo by Anthony Kwan/AP Photo)

A farmer harvests the lotus roots at a lotus pond in the Lingjiaohu Village of Nanxian County, Yiyang City, Central China's Hunan Province on April 26, 2023. Farmers in Lingjiaohu Village of Nanxian County have recently been busy with harvesting lotus roots. (Photo by Xinhua News Agency/Rex Features/Shutterstock)

Horse riders perform during the 23rd Hassan II Trophy of Traditional Equestrian Arts (Tbourida) in Rabat, Morocco, 28 May 2024. Tbourida was inscribed in 2021 on UNESCO's representative list of the intangible cultural heritage of humanity. (Photo by Jalal Morchidi/EPA)