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)

A new book of photos by legendary photographer Weegee shows what industrialized, pre-gentrified New York looked like in the mid-20th century, before the city was crammed with towers and billboards. Here: this combination shows the 1945 photo “Derelict sleeping on the sidewalk outside police headquarters” by Weegee, provided by the International Center of Photography in New York, and a woman walking on the same spot on Wednesday, March 18, 2015. (Photo by AP Photo/Copyright Weegee/The International Center of Photography, Mark Lennihan)

“In spring of 2010 I wanted to try something new and stopped being an architect. That 'something new' turned out to be photography. Wedding photography – to be exact. Today I travel around the world with my personal projects and commissions knowing that there is a lot more exiting stuff to be tried out. Don't be afraid to change something in your life, because for me that was one of the best decisions”. – Tadao Cern (Photo by Tadao Cern)

Tropical acrobatics by Adrià López Baucells in Manaus, Brazil. An unidentified South American marsupial, although the characteristic black markings on its face indicate it may be a mouse opossum. These small creatures are nocturnal and feed on bugs, fruit and bird eggs. (Photo by Adrià López Baucells/2019 Royal Society of Biology Photography Competition)

When wedding photographer Katie Yeaton saw that one of her dogs had white fur and the other had black-and-white fur, she did what only a wedding photographer could do: she threw them a backyard wedding complete with professional photography to remember the day. (Photo by Katie Yeaton)

Anton Jankovoy is professional travel-photographer, shooting in such genres as travel, landscape and portrait photography. Anton has obtained a bronze award at the “FEP (Federation of European Photographers) Professional Photographer of the Year 2011” and bronze award in the russian speaking countries at “Best Photographer 2011”. Anton Jankovoy: «My only aspiration in a photography is to wake up in everybody the realization of life. That is the only one way to feel this world the way it is and how it was created for us, the way the children see it». (Photo by Anton Jankovoy)

A visitor looks at pictures of French photographer Jacques-Henri Lartigue (1894-1986), on July 1, 2013 during the 44thd annual Rencontres d'Arles photography festival in Arles, southern France. The event runs until September 22. (Photo by Boris Horvat/AFP Photo)