Great Horned Owl sitting on an Aspen tree, Alberta, Canada (© Ambre Haller/Getty Images)(Bing United Kingdom)

Silver birch (Betula pendula) woodland, Craigellachie National Nature Reserve, Scotland (© Nature Picture Library/Alamy Stock Photo)(Bing United Kingdom)

Saffron flowers in Spain (© Juan-Carlos Munoz/Minden Pictures)(Bing United Kingdom)

Mount Diablo State Park, California, USA (© Yuval Helfman/Getty Images)(Bing United Kingdom)

Bonfire Night fireworks, Leeds Castle, Kent (© Franz-Marc Frei/Corbis Documentary/Getty Images)(Bing United Kingdom)

Camels gather with their herders at the Pushkar Camel Fair, Rajasthan, India (© Anand Purohit/Getty Images)(Bing United Kingdom)

Jardin des Tuileries leading to the Louvre Museum in Paris, France (© Brian A. Jackson/Getty Images Plus)(Bing United Kingdom)

Chapel St-Michel d'Aiguilhe, Le Puy-en-Velay, France (© Jaubert French Collection/Alamy Stock Photo)(Bing United Kingdom)

The Brandenburg Gate seen through a heart-shaped replica of the Berlin Wall, Berlin, Germany (© Britta Pedersen/picture alliance via Getty Images)(Bing United Kingdom)

Wildflowers in the mist on Mount Howitt in Alpine National Park, Victoria, Australia (© Australian Scenics/Photolibrary/Getty Images Plus)(Bing United Kingdom)

Sand portrait of WW1 Royal Naval Reservist Richard Davies on Ynyslas Beach, Ceredigion (© Keith Morris Aerial Imagery/Alamy Stock Photo)(Bing United Kingdom)

Baby hedgehog (© lorenzo104/Getty Images)(Bing United Kingdom)

Rodrigo Koxa riding the biggest wave ever surfed, on 8 Nov 2017, off the coast of Nazaré, Portugal (© Pedro Cruz/AP Photo)(Bing United Kingdom)

The Crown of Light installation at Durham Cathedral, during the 2013 Lumiere Durham festival (© Stuart Forster/Alamy)(Bing United Kingdom)

Starlings at sunset in Blackpool (© Mediaworld Images/Alamy)(Bing United Kingdom)

Fog shrouds the Bavarian Alps in Germany (© Anton Petrus/Getty Images)(Bing United Kingdom)

For the 30th anniversary of Czechoslovakia's Velvet Revolution, bridges over the Vltava River, including the Charles Bridge and Old Town Bridge Tower, Prague, Czech Republic (© Markus Lange/Offset)(Bing United Kingdom)

Manatees in the Ichetucknee River in Florida, USA (© Jennifer Adler/Alamy)(Bing United Kingdom)

Tantallon Castle at sunset from Seacliff Beach, East Lothian (© Scott Masterton/Westend61/Offset)(Bing United Kingdom)

Gelada monkeys in Simien Mountains National Park, Northern Ethiopia (© Marco Gaiotti/plainpicture)(Bing United Kingdom)

Lantignié in the Beaujolais region of France (© Jon Arnold/Danita Delimont)(Bing United Kingdom)

The Cutty Sark in Greenwich, London for her 150th anniversary (© Grant Rooney Premium/Alamy)(Bing United Kingdom)

An agave plant for Fibonacci Day (© Moab Republic/Shutterstock)(Bing United Kingdom)

A cypress tree in the Atchafalaya Basin, Louisiana, USA (© Chris Moore/Tandem Still + Motion)(Bing United Kingdom)

Monarch butterflies wintering in Michoacán, Mexico (© Sylvain Cordier/Getty Images)(Bing United Kingdom)

Highland cattle in Drenthe province in the Netherlands (© defotoberg/Shutterstock)(Bing United Kingdom)

Jemaa el-Fnaa Square in Marrakesh, Morocco (© Pavliha/Getty Images)(Bing United Kingdom)

Las Catedrales beach, Galicia, Spain (© Davide Seddio/Getty Images)(Bing United Kingdom)

The Maroon Bells, near Aspen, Colorado, USA (© Christopher E. Herbert/Getty Images)(Bing United Kingdom)

Low-lying cloud over Loch Chon, the Trossachs, for St Andrew's Day (© Alistair Dick/Alamy)(Bing United Kingdom)