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.

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.

Jeff Foott / Hiker near waterfall and rainbow, Nevada Fall, Yosemite National Park, California

Shane P. White / Rainbow over waterfall, Iguacu Falls, Brazil

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

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

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.

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.

Sean Crane / Zebra (Equus quagga) mother and foal near rainbow, Ol Pejeta Conservancy, Laikipia, Kenya