Jack Dykinga / Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) near Redrock, Arizona State Trust, Sonoran Desert, Arizona. September 2015. Long exposure with lightning trigger.

Pete Oxford / Waves breaking over bow in rough seas Southern Indian Ocean (Russian ice breaker ship)

Doug Gimesy / Greater crested tern (Thalasseus bergii) flies over breaking waves on a stormy day, with a rainbow in the background, Apollo Bay, Victoria, Australia.

Jack Dykinga / Rainbows over the Santa Catalina Mountains at sunset following a powerful monsoon storm, Sonoran Desert, Arizona, USA.

David Noton / Rainbow over Mupe Bay on Christmas Eve, Jurassic Coast, Dorset, England, UK. December 2019.

Alex Hyde / Common Orb Weaver (Metellina sp.) male. With the camera at a very precise angle to the sun, the silk of the web refracted the light into a rainbow of coloured bands.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) and Boojum tree (Fouquieria columnaris) in Sonoran Desert, rainbow in background. Catavina, Valle de los Cirios Reserve, Baja California, Mexico.

Ross Hoddinott / St Michael's Mount at sunrise with a rainbow over Penzance, Marazion, Wesat Cornwall, UK. February.

Erlend Haarberg / Fogbow over sea ice. Fogbows are similar to a rainbow, but produced by very small droplets in fog or cloud, which diffract light, instead of large raindrops which do not, Svalbard, Norway, July.

Jack Dykinga / Rainbow over Long Canyon with fall coloured Cottonwood (Populus) trees against canyon walls, Burr Trail, Grand Staircase-Escalante National Monument, Utah, USA, October 2018.

Paul Hobson / Keel-billed toucan (Ramphastos sulfuratus) perched on branch with beak open. Laguna del Lagarto, Alajuela, Costa Rica.

Steven David Miller / Rainbow lorikeet (Trichoglossus moluccanus) on a branch, Cania Gorge National Park, Queensland, Australia. September.

Stephane Granzotto / Long-finned pilot whale (Globicephala melas) blowing at surface with rainbow affect in the spray, Mediterranean Sea, Corsica

Ashley Cooper / Rainbow over water flowing out of the Karahnjukar dam and Halslon reservoir, a massive new controversial hydro electricity project in North East Iceland. It was created by damming the Jokuls a Dal riv...

Jack Dykinga / Rainbow over petrified sand dunes at sunset, Vermilion Cliffs National Monument, Paria Canyon-Vermilion Cliffs Wilderness, Arizona, USA.

Alex Mustard / Great hammerhead shark (Sphyrna mokarran) swimming over a sandy seabed, accompanied by Rainbow runners (Elagatis bipinnulata) South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream,...

Bence Mate / Leaf cutter ants (Atta sp) carrying colourful plant matter, reflected in water, Laguna del Lagarto, Santa Rita, Costa Rica

Niall Benvie / Jokulsarlon lagoon at dawn with rainbow in the sky. Iceland, October 2015.

Orsolya Haarberg / View of a rainbow in the spray of Bjornefossen Waterfall, Saltfjellet-Svartisen National Park, Norway, August 2015.

Brent Stephenson / Three King penguins (Aptenodytes patagonicus) in light drizzle with a faint rainbow in the background, St Andrew's Bay, South Georgia, South Atlantic, January.

Alex Hyde / Sheetweb weaving spider (Linyphiidae) in web at sunset. The silk is refracting the light into a rainbow of coloured bands. Slovenia, July.

Jack Dykinga / Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) Avra Valley, Saguaro National Park, Tucson Mountains, Arizona, USA, August 2015. Long exposure with lightning trigger.

Ole Jorgen Liodden / Nazca booby (Sula granti) in flight with rainbow behind, Galapagos.

Denis-Huot / Cheetah (Acinonyx jubatus) resting with rainbow behind it, Masai-Mara Game Reserve, Kenya. September.

Hougaard Malan / Rainbow over desert landscape. Namib Rand, Namibia. February 2011.

Hougaard Malan / Sunlight illuminating a mountain below a rainstorm. Namib Rand, Namibia. February 2011.

Hougaard Malan / Rainbow over the Augrabies waterfall in flood. Augrabies National park, Northern Cape, South Africa. January 2011.

Hougaard Malan / Rainbow in the spray over Victoria Falls. Zimbabwe, Africa. November 2012.

Olga Kamenskaya / Pyramidal ice fragment reflected on the surface of Lake Baikal. Ice fragment acting as a prism refracting light into rainbow. Siberia, Russia, March.

Dong Lei / Jungle Crow (Corvus macrorhynchos) perched on tree branch with rainbow, Shejila mountain, Qinghai-Tibetan Plateau, Tibet, China. July.

Kirkendall-Spring / Lower Yellowstone Falls with rainbow, on the Yellowstone River viewed from Lookout Point Trail, Yellowstone National Park, Wyoming, USA, June 2013.

Bence Mate / Keel billed toucan (Ramphastos sulfuratus) in aggressive encounter with Montezuma Oropendola (Psarocolius montezuma) in rain, Laguna del Lagarto, Santa Rita, Costa Rica. Front cover bookplate of the H...

Claudio Contreras / Keel billed toucan (Ramphastos sulfuratus) calling, captive.

Claudio Contreras / Keel billed toucan (Ramphastos sulfuratus), captive.

Visuals Unlimited / Rainbow Starfrontlet (Coeligena iris) hovering portrait, Utuana Reserve, Ecuador.

Alex Mustard / Portrait of a spotted sunfish (Lepomis punctatus) in front of reeds in a river. Rainbow River, Florida, United States of America.

Alex Mustard,Alex Mustard / Rainbow trout (Oncorhynchus mykiss) under trees, Capernwray Lake, Lake District, England, UK.

Kim Taylor / Rainbow Shield Bug (Calidea dregii) Endemic to Southern Africa.

Ernie Janes / Sherringham off shore windfarm in distance, and rainbow during storm, Weybourne, Norfolk, November

Ben Lascelles / Great Dusky Swift (Cypseloides senex) Birds flying past rainbow created by waterfalls, Iguazu National Park, Argentina, October 2008

Andy Trowbridge / Underwater view of rainbow trout (Oncorhynchus mykiss) being released by a fly fisherman in a small spring fed stream, North Canterbury, South Island, New Zealand. December, 2011.

Jack Dykinga / Saguaro Cactus (Carnegiea gigantea) against summer monsoon sky with rainbow and streaks of lightning. Sonoran Desert, near Tucson, Arizona, August 2012.

Ben Lascelles / Iguazu waterfalls, Iguacu National Park, Argentina. October 2008.

Danny Green / 2020VISION / Whooper Swans (Cygnus cygnus), ducks and wigeon feeding in the estuary, Caerlaverock WWT, Scotland, Solway, UK, January.

Terry Whittaker / 2020VISION / Common sea lavender (Limonium vulgare) and Sea purslane (Halimione portulacoides) growing on regenerated saltmarsh habitat, with rainbow, Abbotts Hall Farm Nature Reserve, Essex, England, UK, July 201...

Erlend Haarberg / Northern fulmar (Fulmarus glacialis) with optical glory phenomenon in mist, Hornvik, Hornstrandir Nature Reserve, West Fjords, Iceland, July 2008