Global wildlife populations will decline by 67% by 2020 unless urgent action is taken to reduce human impact on species and ecosystems, warns the biennial Living Planet Index report from WWF (World Wide Fund for Nature) and ZSL (Zoological Society of London). From elephants to eels, here are some of the wildlife populations most affected by human activity. Here: The maned wolf is among the large mammals in the Brazilian Cerrado that are threatened by the increasing conversion of grasslands into farmland for grazing and growing crops. (Photo by Ben Cranke/Nature Picture Library/Alamy Stock Photo)

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)

The Elephant Rock is a natural rock formation found on the island of Heimaey (meaning Home Island) in Iceland’s Vestmannaeyjar archipelago (say that 10 times fast).

Most beautiful pictures are those made in nature. Nothing compares with the expression of a tiger, the majestic flight of an eagle or the strength of a white bear. Below you can see 15 the most beautiful animal photographs that will capture your attention.

A bearded men participates in the 26th International Alpine Beard Competition on August 21, 2011 in Chur, Switzerland. Participants from Switzerland, Bavaria and Austria are to be chosen for the most genuine, natural grown beard. (Photo by Johannes Simon/Getty Images)

Internet is filled to the brim with cat pictures and cat videos. It seems that cats became the symbol of the internet. For some unknown reason, cat owners simply love taking pictures of their beloved kitty-cats and posting them on the internet for all to see. Everyone’s cat is special; however, some are more special than others. Take Garfi for example. As soon as you catch his menacing stare, you immediately realize the reason why this kitty became popular. The look he gives you would send shivers down anybody’s spine. Yeah, the look Garfi has is somewhat special, but nothing will compare to the “facial expression” of Tard – the Grumpy Cat! A look that screams – “All is lost! Life has no meaning…”. (Photo by Hulya Ozkok)

The anthropometric record card of Sarah Giles, a servant who was convicted of stealing in 1897, on display making up part of a mosaic of cards on a table top during a press preview for the Crime Museum Uncovered exhibition at the Museum of London in the City of London, Wednesday, October 7, 2015. Drawn from Scotland Yard's private collection, the show charts more than a century of violence and suffering, from the murders of Jack the Ripper to IRA and al-Qaida bombings. But it also celebrates the brains, bravery and scientific advances that helped catch perpetrators and solve crimes. (Photo by Alastair Grant/AP Photo)