Old World swallowtail butterflies on a flower (© Alberto Ghizzi Panizza/Getty Images)

Two Old World swallowtail butterflies on a flower (© Alberto Ghizzi Panizza/Getty Images)

Southern cassowary father with chicks, Kuranda, Queensland, Australia (© Martin Willis/Minden Pictures)

Surfers catching waves at Palm Beach on the Gold Coast, Queensland, Australia (© Darren Tierney/Getty Images)

Balsamroot wildflowers bloom below the Teton Mountains in Grand Teton National Park, Wyoming, USA (© Mike Cavaroc/Tandem Stills + Motion)

Seungseon Bridge at Seonam Temple in Jogyesan Provincial Park, South Korea (© Aaron Choi/Getty Images)

Great Smoky Mountains National Park, Tennessee, USA (© Tony Barber/Getty Images)

Bridges, Not Walls installation by Luke Jerram cover Llangollen Bridge, Denbighshire. (© Christopher Furlong/Getty Images)

Elephant walking in the Okavango River, Botswana (© Markus Pavlowsky/Getty Images)

Cliffs of the Sierra Ponce and Rio Grande River, Big Bend National Park, Texas, USA (© Tim Fitzharris/Minden Pictures)

Misool Island, one of the four major islands in the Raja Ampat Islands in West Papua, Indonesia (© Elsy Saldek/Getty Images)

Poppies in bloom, Moravia, Czech Republic (© rusm/Getty Images)

Sweetheart Abbey, Dumfries and Galloway (© Westend61/Getty Images)

Long-beaked common dolphin pod and diving Cape gannets hunting Pacific sardines off the Eastern Cape, South Africa (© Pete Oxford/Minden Pictures)

Haaga Rhododendron Park, Helsinki, Finland (© Samuli Vainionpää/Getty Images)

An indigo bunting at the John James Audubon Center at Mill Grove in Audubon, Pennsylvania, USA (© Vicki Jauron/Getty Images)

Street party for the coronation of Queen Elizabeth II in 1953 (© KGPA Ltd/Alamy)

Glass bridge of Zhangjiajie, Hunan, China (© MediaProduction/Getty Images)

Cycling across a natural rock arch in the desert near Moab, Utah, USA (© Whit Richardson/Cavan)

Floral display in honour of HM Queen Elizabeth II (© Vibrant Pictures/Alamy)