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

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

Oyster mushrooms in Belgium (© Philippe Clement/Minden Pictures)

Aerial photograph over Whitehall and St James's Park, London (© Howard Kingsnorth/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)

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

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

View towards the Church of Saint-Cirq-Lapopie, Lot Valley, south-west France (© Reinhard Schmid/Huber/eStock Photo)

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

Geghard Monastery, Armenia (© traumlichtfabrik/Getty Images)

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

Poenari Castle on Mount Cetatea, Făgăraș Mountains, Romania (© porojnicu/Getty Images)

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, USA (© Ralph Pace/Minden Pictures)

Snowy Norway spruce forest at sunset, Thuringia, Germany (© Frank Sommariva/ImageBROKER/Offset by Shutterstock)

View of a tractor and trailers of cabbage in a field in Sankt Pölten, Austria (© Stephan Zirwes/Getty Images)

View of the harbour in Sitka, Alaska, USA (© Blaine Harrington III/Alamy)

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

｢ビーバー・レイク・ネイチャー・センター｣米国ニューヨーク州, オノンダガ郡 (© Chris Murray/Alamy)

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

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

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

United Nations headquarters, New York, USA (© Sean Pavone/Alamy)

Grizzly bear cub relaxing, Lake Clark National Park, Alaska, USA (© Erlend Krumsvik/Getty Images)

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

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

A pumpkin patch in British Columbia, Canada (© James Chen/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, USA (© Alex Potemkin/Getty Images)

Blakiston's fish owl in Hokkaido, Japan (© Martin Bailey/Offset by Shutterstock)

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