Jeff Vanuga / Old Faithful Geyser erupting at -30 Celsius in winter. Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2015.

Anup Shah / Japanese Macaque (Macaca fuscata) baby sitting on the edge of thermal hotspring pool. Jigokudani Yean-Koen National Park, Japan, February.

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

Espen Bergersen / Hot spring called 'Geysir' which has been quiet for many years. Iceland. May 2016.

Espen Bergersen / Aerial veiw of a hot spring in the Gunnuhver geothermal area, Iceland.

Espen Bergersen / Aerial view of a mud pool in the Gunnuhver geothermal area, Iceland. May.

Mike Read / Terrace Spring Mammoth Hot Springs Mammoth Yellowstone National Park Wyoming USA June 2015

Wim van den Heever / Japanese macaque (Macaca fuscata) still soaked from climbing out of the hot spring, Jigokudani, Nagano, Japan.

Wim van den Heever / Japanese macaque (Macaca fuscata) sitting portrait, Jigokudani, Nagano, Japan.

Pascal Kobeh / West Indian manatees (Trichechus manatus latirostris) group sleeping in the more temperate springs of Three Sisters Springs, Crystal River, Florida, USA

Pascal Kobeh / West Indian manatees (Trichechus manatus latirostris) calf trying to suckle from mtoher in the more temperate springs of Three Sisters Springs, Crystal River, Florida, USA

Pascal Kobeh / Snorkelers swimming in the more temperate waters of King Springs, looking for West Indian manatees (Trichechus manatus latirostris) with early morning fog, Crystal River, Florida, USA