Floris van Breugel / Sunset on the outer coast of Chichagof Island with the White Sulphur Hotsprings in the distance, South East Alaska, USA, July

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) with icy strands of fur on its head, Jigokudani, Japan, February

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) females gather at one end of the hot springs, Jigokudani, Japan, February

Nick Garbutt / Morning Glory thermal pool surrounded by snow, coniferous forest in background. Near Daisy Geyser Basin, Yellowstone National Park, USA. January 2019.

Ch'ien Lee / Rafflesia (Rafflesia keithii) flower, Poring Hotsprings, Sabah, Borneo, Malaysia

Floris van Breugel / Person in White sulphur hotsprings, Chichagof island, South East Alaska, USA, July. model released

Wim van den Heever / Whooper swans (Cygnus cygnus) in misty hot springs, Lake Kussharo, Hokkaido, Japan, February.

Paul Hobson / Map of Mammoth hotsprings, Yellowstone, Wyoming, USA, February.

Pete Oxford / Local people at Savusavu Bay Hotsprings, natural hot springs used for cooking and steam therapy. Vanua Levu, Fiji, South Pacific, April 2014.

Rhonda Klevansky / Tourist at hotsprings, in the Salar de Chalviri salt flats, Altiplano, Bolivia. February 2009.

Floris van Breugel / Turquoise Hotsprings at sunset, Yellowstone National Park, Wyoming, USA. September 2009.

Diane McAllister / Japanese Macaque (Macaca fuscata) drinking from hotsprings, Jigokudani, Japan. February