Emperor penguin adults and chicks at the Snow Hill Island rookery, Antarctica (© Martin Ruegner/Getty Images)

Lantern display celebrating the Mid-Autumn Festival in Singapore (© Khin/Getty Images)

Owens River and the Sierra Nevada near Bishop, California (© Interfoto/Danita Delimont)

Brown bear in the Brooks River, Katmai National Park, Alaska (© littleting/Pradthana Jarusriboonchai/Getty Images)

Montage of images of Jupiter and its volcanic moon, Io (© NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Goddard Space Flight Center)

Yuncheng Salt Lake in Yuncheng, Shanxi province, China (© Xinhua/Alamy)

Autumn mist above Restormel Castle in Cornwall, England (© Robert Harding/Alamy)

Blanket octopus in Palm Beach, Florida (© Steven Kovacs/Minden Pictures)

Roaring Fork in Great Smoky Mountains National Park, Tennessee (© Bernie Kasper/Getty Images)

Aerial view of American flamingos flying over Los Roques Archipelago National Park, Venezuela (© Cristian Lourenco/Getty Images)

Monastery of Geghard, Armenia (© traumlichtfabrik/Getty Images)

Killarney Provincial Park, Ontario, Canada (© Jeffery D. Walters/Getty Images)

Red fox in the Netherlands (© Wim Weenink/Minden Pictures)

Dragonfly fossil, about 150 million years old, in Solnhofen, Bavaria, Germany (© Ingo Arndt/Minden Pictures)

Ochre sea star on kelp off the coast of California (© Ralph Pace/Minden Pictures)

Cabbage field in Sankt Pölten, Austria (© Stephan Zirwes/Getty Images)

Pisgah National Forest near Brevard, North Carolina (© Adam Jones/Danita Delimont)

Harbor in Sitka, Alaska (© Blaine Harrington III/Alamy)

The Mati Si (Horse's Hoof Temple) and grottoes of Mati Si Scenic Area, Gansu province, China (© Ana Flašker/Alamy)

Bare trees and autumn ferns in Beaver Lake Nature Center, New York (© Chris Murray/Alamy)

Chameleon walking on a plant, Indonesia (© SnapRapid/Offset by Shutterstock)

Starlings flock over Lauwersmeer National Park, Netherlands (© Frans Lemmens/Alamy)

Old general store of Bents, Saskatchewan, Canada (© ImagineGolf/Getty Images)

New York City skyline with United Nations headquarters (© Sean Pavone/Alamy)

A pumpkin patch in British Columbia, Canada (© James Chen/Shutterstock)

Corfe Castle, Dorset, England (© Ross Hoddinott/Minden Pictures)

Cambron Covered Bridge in Green Mountain Park, near Huntsville, Alabama (© Jens Lambert/Shutterstock)

Grotesques of native Ecuadorian seabirds on the Basílica del Voto Nacional in Quito, Ecuador (© Henri Leduc/Getty Images)

Mazezilla corn maze at Klingel's Farm in Pennsylvania (© Alex Potemkin/Getty Images)

Northern Saw-whet Owl (Aegolius acadicus) perching in a wild rose bush in British Columbia (© Tim Fitzharris/Minden Pictures)

Dark Hedges in County Antrim, Northern Ireland (© VanderWolf Images/Shutterstock)