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

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

Autumn leaves and lichen in Junction Sheep Range Provincial Park, B.C. (© Daryl Benson/Masterfile)

Bibliothèque du Palais Bourbon pour le prix Goncourt, Paris, France (© Hemis/Alamy Photostock)

Stepping stones in Tollymore Forest Park, County Down, Northern Ireland (© Chris Curry/500px)

Saffron crocus flowers in Spain (© Juan-Carlos Munoz/Minden Pictures)

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

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

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

Frost on blueberry plants, New Brunswick (© Freeman Patterson/Masterfile)

Battle site encompassing Commonwealth graves, historical remains and a memorial and interpretation centre at Vimy Ridge, France (© David Broadbent/Alamy Stock Photo)

Baby hedgehog (© lorenzo104/Getty Images)

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

The 'Crown of Light' installation is projected onto Durham Cathedral during the 2013 Lumiere Durham festival in England (© Stuart Forster/Alamy)

Starlings at sunset in Blackpool, England (© Mediaworld Images/Alamy)

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

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)

Manatees in the Ichetucknee River in Florida (© Jennifer Adler/Alamy)

Fall colours in Zion National Park, Utah (© pabradyphoto/Getty Images)

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

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

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

For Fibonacci Day, an agave plant (© Moab Republic/Shutterstock)

A cypress in the Atchafalaya Basin, Louisiana (© Chris Moore/Tandem Still + Motion)

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

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

Gray Jay (Perisoreus canadensis) resting on a branch at Algonquin Provincial Park, Ont. (© Ron Erwin/Alamy Stock Photos)

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

Jemaa el-Fnaa Square in Marrakesh (© Pavliha/Getty Images)

Christmas Lights and Christmas tree at Nathan Phillips square, Toronto (© Bert Hoferichter/AgeFotostock)