Pale-throated sloth perched in a tree on Sloth Island, Essequibo River, Guyana (© Suzi Eszterhas/Minden Pictures)

秋天的罗梦湖和特罗萨克斯国家公园，苏格兰 (© Jon Arnold/Danita Delimont)

The Trossachs National Park in autumn, Stirling, Scotland (© Jon Arnold/Danita Delimont)

Adélie penguins at Possession Island, Antarctica (© Tui De Roy/Minden Pictures)

Sequence of enhanced-color images of Jupiter (© Enhanced Image by Gerald Eichstädt and Sean Doran, CC BY-NC-SA, based on images provided Courtesy of NASA/JPL-Caltech/SwRI/MSSS)

Tintern Abbey, Wales (© Lynda Morris Photography/Getty Images)

Cleveland Clinic Lou Ruvo Center for Brain Health in Las Vegas, Nevada, USA (© Garry Belinsky/Offset)

Greater flamingo trio taking flight from Odiel wetland in Huelva, Andalusia, Spain (© Óscar Díez/Minden Pictures)

莱奇沃思州立公园，纽约 (© Jay O'Brien/Danita Delimont)

Letchworth State Park, New York (© Jay O'Brien/Danita Delimont)

Arches National Park, Moab, Utah (© Whit Richardson/Alamy Stock Photo)

巴克拉纳帆船赛百舸争流，意大利的里雅斯特港 (© Ababsolutum/E+/Getty Images)

Boats massing for the Barcolana regatta in the Gulf of Trieste, Italy (© Ababsolutum/E+/Getty Images)

Misty sunrise in Ashdown Forest, East Sussex (© Tim Stocker Photography/Getty Images)

蜻蜓翅膀特写 (© Azwar Thaufeeq/500px/Getty Images)

阿卡迪亚国家公园的高丛蓝莓植物，缅因州 (© Danita Delimont/Gallo Images/Getty Images Plus)

A fossilized carboniferous fern (© Juan Carlos Munoz/Minden Pictures)

Autumn leaves and goldfish in Tokyo, Japan (© qrsk/Moment/Getty Images)

Chimney Rock and Uncompahgre National Forest, Colorado (© Cory Marshall/Tandem Stills + Motion)

Aerial view of a pumpkin patch in Half Moon Bay, California (© Tinker Street/Michael O'Neal/Gallery Stock)

Eine Amsel beim Verspeisen eines Holzapfels in einem Garten in Wiltshire, England, Großbritannien (© Nick Upton/Minden Pictures)

丘吉尔哈德逊湾附近的北极熊一家，加拿大马尼托巴省 (© Marco Pozzi Photographer/Getty Images)

County Bridge in New Hampshire, USA (© Denis Tangney Jr/E+/Getty Images)

Ring-tailed lemurs in Madagascar for World Lemur Day (© Image Source/Alamy)

Ring-tailed lemurs in Madagascar (© Image Source/Alamy)

Red wattlebird, Victoria, Australia (© plainpicture/Minden Pictures/Jan Wegener/BIA)

Naranjo de Bulnes peak, in Picos de Europa National Park, Asturias, Spain (© Anton Petrus/Getty Images)

Chauves-souris Roussettes Paillées africaines dans le parc national de Kasanka, Zambie (© Nick Garbutt/Minden Pictures)

Straw-colored fruit bats in Kasanka National Park, Zambia (© Nick Garbutt/Minden Pictures)

Charles Bridge over the Vltava River in Prague, Czech Republic (© Martin Moxter/Offset)

一只坐在白杨树上的大雕鸮，阿尔伯塔 (© Ambre Haller/Getty Images)