Theo Bosboom / Beech trees (Fagus sylvatica) in autumn, seen from under bubbling brook, the Netherlands, November. Runner up in Creative Visions category of the Wildlife Photographer of the Year 2013 competition

Gerrit Vyn / Ruddy Duck (Oxyura jamaicensis) male in breeding plumage performing a "bubbling display"which is used in both courtship and aggressive territorial encounters. The male holds its head and tail and 2 ro...

Sergey Gorshkov / Bubbling geothermal mud pool, Kamchatka, Russia

Nick Upton / Flesh fly (Sarcophaga sp.) "bubbling" regurgitated stomach contents in order to increase the concentration of its food by evaporating excessive water content. Wiltshire, UK, September.

Nick Upton / Flesh fly (Sarcophaga sp.) "bubbling" regurgitated stomach contents in order to increase the concentration of its food by evaporating excessive water content. Wiltshire, UK, September.

Ashley Cooper / Fumaroles emitting steam in the geothermal area of Hverir near Myvatn, northern Iceland, September 2010.

Ashley Cooper / Bubbling mud pools in the geothermal area of Hverir near Myvatn, Northern Iceland. September.

Oliver Hellowell / Bubbling water in fountain at Tretower Court, near Crickhowell, Powys, Wales, UK. July

Jen Guyton / Bubbling kassina (Kassina senegalensis) on white background, Greater Gorongosa Ecosystem, Mozambique. Controlled conditions.

Doug Perrine / Molten lava boiling in a lava lake in a pit below the crater floor of Halemaumau Crater, Kilauea Volcano, Hawaii. May 2015.

Merryn Thomas / Women dying wool in Planeterra-supported women's weaving project, Huchuy Qosco indigenous village, Sacred Valley, Peru. December 2013.

Eric Baccega / Nenet woman checking water for tea, inside tent. Yar-Sale district. Yamal, Northwest Siberia, Russia. April 2016.

Cyril Ruoso / Boiling mudpot, Namafjall, Iceland, August.

Cyril Ruoso / Boiling mudpot, Namafjall, Iceland, August.

Cyril Ruoso / Boiling mudpot, Namafjall, Iceland, August.

Cyril Ruoso / Boiling mudpool, Namafjall, Myvatn, Iceland. August.

Nick Upton / Paper wasp (Polistes dominulus) bubbling regurgitated nectar in morning sunshine to speed digestion, Greece, August.

Fabrice Cahez / Forest reflected in bubble from small puddle, Vosges, France, May.

Jan Hamrsky / Lesser silver water beetle (Hydrochara caraboides) with bubble of air on its underside, Europe, June, controlled conditions

Olga Kamenskaya / Lines of bubbles caught in ice of Lake Baikal, Siberia, Russia, March.

Nick Upton / Mat of Green freshwater algae blooming on a damp draincover, releasing oxygen bubbles through photosynthesis, Wiltshire, UK, May.

Chris & Monique Fallows / Cape Gannets (Morus capensis) diving underwater to feed on sardines, Port St Johns, Transkei, South Africa.

Alex Mustard / Mosquito larva (Culicidae) in a shallow pool filled with vegetation. Giara GiarDi Gesturi National Park, Sardinia, Italy.

Jan Hamrsky / Water spider (Argyroneta aquatica) detail of air bubble around its abdomen, Europe, July, controlled conditions

Jan Hamrsky / Water spider (Argyroneta aquatica) refilling its air supply, Europe, July, controlled conditions

Jan Hamrsky / Water spider (Argyroneta aquatica) with air bubble, Europe, July, controlled conditions

Theo Bosboom / Close up of leaves (probably of purple moor grass) and bubbles captured in the ice, Deeler Woud Nature Reserve, the Netherlands, January

Nick Upton / Face fly / Autumn house fly (Musca autumnalis) bubbling its stomach contents to speed digestion, Wiltshire garden, UK, April.

Orsolya Haarberg / Boiling bubbling mud, Hverir, Iceland.

Nick Upton / Noon fly / Noonday Fly (Mesembrina meridiana) 'bubbling' stomach contents, perhaps a form of external digestion in flies. Wiltshire, UK, May.

Guy Edwardes / Bubbling mud pools near Grindavik, Iceland, July 2009

Nick Upton / Lance fly (Dasiops sp. possibly Dasiops spatiosus) 'bubbling' regurgitated stomach contents in order to increase the concentration of its food by evaporating excessive water content, Wiltshire, UK,...

Chadden Hunter / Ted Giffords (cameraman) assisted by Jeff Wilson swings the end of a ‘jib arm' in order to glide the camera over Erta Ale, a bubbling lava lake, for Mountains episode of the BBC tv series Planet Eart...

Chadden Hunter / Ted Giffords (cameraman) assisted by Jeff Wilson swings the end of a ‘jib arm' in order to glide the camera over Erta Ale, a bubbling lava lake, for Mountains episode of the BBC tv series Planet Earth...

Chadden Hunter / Film crew being dropped off by Ethiopian military helicopter beside the permanently bubbling Erta Ale lava lake, Erta Ale volcano, Danakil Desert, Ethiopia, November 2003. Filming for the Mountains e...

Jouan & Rius / Bubbling hot mud springs, geothermal area of Krafla, North Iceland 2005

Inaki Relanzon / People photographing bubbling hot mud springs, geothermal area of Krafla, North Iceland

Inaki Relanzon / People photographing bubbling hot mud springs, geothermal area of Krafla, North Iceland

Inaki Relanzon / Person photographing bubbling hot mud springs, geothermal area of Krafla, North Iceland

Juergen Freund / Christmas Island red crab {Gecarcoidea natalis} bubbling, indicative of stress, Christmas Is, Indian Ocean

Juergen Freund / Christmas Island red crab {Gecarcoidea natalis} bubbling, indicative of stress, Christmas Is, Indian Ocean

Juergen Freund / Stressed Christmas Island red crab bubbling at mouth (Gecarcoidea natalis) Indian Ocean, Australia

Steven David Miller / Boiling mud at Leaping Frog mudpool, Whakarewarewa Thermal reserve, Rotorua, North Island, New Zealand

Paul Johnson / Gas bubbling up from gas pool, Soos Nature Reserve, Czech Republic

Pete Cairns / Black grouse male 'bubbling' display at lek {Tetrao tetrix} Cairngorms NP, Scotland, UK

Igor Shpilenok / Volcanic Bubbling pool from the Uzon volcano, Kronotsky Zapovednik, Russia.

Fabio Liverani / Boiling mud, Las Pailas sector, Rincon de la Vieja NP. Guanacaste, Costa Rica

Fabio Liverani / Boiling mud, Las Pailas sector, Rincon de la Vieja NP. Guanacaste, Costa Rica

Fabio Liverani / Boiling mud, Las Pailas sector, Rincon de la Vieja NP. Guanacaste, Costa Rica

Juergen Freund / Diver at bubbling underwater volcano. Indo-pacific ocean.

Cyril Ruoso / Bubbling mud pot, Namafjall, Iceland

Roberto Rinaldi / The coast at Bubbling pool, Jost Van Dyke Island (JV Dyke), British Virgin Islands (BVI)

Roberto Rinaldi / The coast at Bubbling Pool on the east end of Jost Van Dyke Island (JV Dyke), British Virgin Islands (BVI)

Roberto Rinaldi / The coast at Bubbling Pool on the east end of Jost Van Dyke Island (JV Dyke), British Virgin Islands (BVI)

Juergen Freund / Stressed Christmas Island red crab bubbling {Gecarcoidea natalis} Indian Ocean,

Joel Sartore / Photo Ark / Indochinese green magpie (Cissa hypoleuca) female looking around. The animal performs bubbling with throat. Los Angeles Zoo & Botanical Gardens. Captive.

Gary Braasch / Inupiat hunter boiling a walrus head to make ready for carving. Carving of walrus tusk, ivory and whalebone is a livelihood for many Yup'ik and Inupiat artists, Wainwiright, Alaska, USA. July, 2015.

Derek Galon / Tilt up shot of Boiling Lake, the second largest of its kind in the world, Dominica, West Indies, 2020.

Derek Galon / Aerial tilt up shot moving from a view of Boiling Lake to surrounding tropical forest and areas of deforestation, Dominica, West Indies, 2020.

Derek Galon / Aerial shot ascending over the Boiling Lake the second largest boiling lake in the world, Dominica, 2020.

Derek Galon / Aerial shot ascending over Boiling Lake, the second largest in the world, Dominica, 2020.