Todd Pusser / Female Dense beaked whale {Mesoplodon densirostris} surfacing, Bahamas, Caribbean.

Gabriel Rojo / Southern right whale (Eubalaena australis) expelling air and spray through blow hole. Valdes Peninsula, Chubut, Patagonia, Argentina. October.

John Shaw / Spray shoots up from a blow hole on the Dyrholaey Peninsula, near Vik, Iceland, March.

Ashley Cooper / Peale's dolphin (Lagenorhynchus australis) bow riding off the front of a boat, Falkland Islands, South Atlantic. February.

Gabriel Rojo / Southern right whale (Eubalaena australis) surfacing, blow hole visible, Peninsula Valdes, , Patagonia, Argentina.

Doc White / Gray whale (Eschrichtius robustus) blow hole with barnacles and whale lice, Scammons Lagoon, Baja California, Mexico

Doc White / Gray whale (Eschrichtius robustus) blow hole, barnacles and whale lice, Scammons Lagoon, Baja California, Mexico

Mark Carwardine / Bryde's / Tropical whale (Balaenoptera edeni) surfacing showing blow hole, Sea of Cortez, Gulf of California, Baja California, Mexico, October

Mark Carwardine / Bryde's / Tropical whale (Balaenoptera edeni) surfacing showing blow hole, Sea of Cortez, Gulf of California, Baja California, Mexico, October

Luis Quinta / Blue whale (Balaenoptera musculus) surfacing, showing blow hole, Pico Island, Azores, Portugal. May.

Luis Quinta / Blue whale (Balaenoptera musculus) surfacing, showing blow hole, Pico Island, Azores, Portugal. May.

Espen Bergersen / Fin whale (Balaenoptera physalus) at surface showing blow hole. Fishing boat in background. Andfjorden close to Andoya, Nordland, Northern Norway. January.

Doc White / Blue Whale (Balaenoptera musculus) at sea surface with spray from blow hole. California, USA.

Doc White / Blue Whale (Balaenoptera musculus) at sea surface with spray from blow hole. California, USA.

Doc White / Blue Whale (Balaenoptera musculus) at sea surface with spray from blow hole. California, USA.

Doc White / Blue Whale (Balaenoptera musculus) at sea surface with spray from blow hole. California, USA.

Mark Carwardine / Sei whale (Balaenoptera borealis) at surface, Sea of Cortez (Gulf of California), Baja California, Mexico, Endangered species

Mark Carwardine / Sei whale (Balaenoptera borealis) surfacing, blow-hole visible, Baja California, Sea of Cortez (Gulf of California), Mexico, Endangered species

Mark Carwardine / Blue whale surfacing, showing blow hole, Mexico {Balaenoptera musculus} Sea of Cortez, Mexico

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) blow-hole and back. Scratch marks are thought to be from social interactions or competition with other dolphin. Tin Can Bay, Queensland, Australia, Sept...

Mark Carwardine / Grey Whale (Eschrichtius robustus) calf with head above the water surface. Whale lice are visible around the blow-hole. San Ignacio Lagoon, Baja California, Mexico, February.

Eric Baccega / Narwhal (Monodon monoceros) showing tusk above water surface surrounded by blow-hole spray. Baffin Island, Nunavut, Canada, June.

Doug Allan / Weddell seal (Leptonychotes weddellii) breathing at surface of sea ice through blow hole. Ross Sea, Antarctica.

Steven David Miller / Two young male Humpback Whales (Megaptera novaeangliae) surfacing for air, Hervey Bay, Queensland, Australia

Steven David Miller / Humpback Whale (Megaptera novaeangliae) surfacing for air, exposing its blowhole. Hervey Bay, Queensland, Australia

Wild Wonders of Europe / Liodden / Minke whale (Balaenoptera acutorostrata) emerging through blow hole in ice sheet, Spitsbergen, Svalbard, Norway, June 2009

Matthew Maran / The Blowhole at Fletchers Beach, Ucluth Peninsular, Vancouver Island, British Columbia, Canada

Matthew Maran / The Blowhole at Fletchers Beach, Ucluth Peninsular, Vancouver Island, British Columbia, Canada

Philippe Clement / European Lugworm {Arenicola marina} burrows showing the characteristic depression at the head ends (blow hole) and a cast of defaecated sediment at the tail ends, North Sea, Belgium

Philippe Clement / European Lugworm {Arenicola marina} burrow showing the characteristic depression at the head end (blow hole) and a cast of defaecated sediment at the tail end, North Sea, Belgium

Philippe Clement / European Lugworm {Arenicola marina} burrow showing the characteristic depression at the head end (blow hole) and a cast of defaecated sediment at the tail end, North Sea, Belgium

Juergen Freund / Dwarf minke whale {Balaenoptera acutorostrata}breaking surface to breathe, exposing blow hole, Queensland, Australia

Juergen Freund / Dwarf minke whale {Balaenoptera acutorostrata}breaking surface to breathe, exposing blow hole, Queensland, Australia

Todd Pusser / Blowhole of Short finned pilot whale {Globicephala macrorhynchus} Atlantic

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) cow cooling off in blow hole spray, Punta Suarez, Hood Island, Galapagos Islands, Ecuador

Flip Nicklin / Sperm Whale (Physeter macrocephalus) blow hole and bubbles, Sri Lanka

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) blow hole, Southeast Alaska

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) blow hole, Southeast Alaska

TOM WALMSLEY / Southern right whale head and blow hole. Off coast of South Africa {Balaena glacialis australis}

Martha Holmes / Bowhead whale at blow hole (Balaena mysticetus) Arctic

Gabriel Rojo / Blow hole of Southern right whale underwater {Balaena glacialis australis} Argentina

Juergen Freund / Minke whale with blow hole open {Balaenoptera acutorostrata} Great barrier reef Australia

Martha Holmes / Bowhead whale at blow hole {Balaena mysticetus} Arctic

Sylvain Cordier / Grey whale (Eschrichtius robustus) blow hole above water, tourists observing from boat in background. Magdalena Bay, Puerto San Carlos, Baja California Sur, Mexico. 2017