Cyril Ruoso / Japanese Giant Salamander (Andrias japonicus) male guarding nest with eggs, he releases bubbles of air after having come to the surface to breath, Honshu, Japan

Yva Momatiuk & John Eastcott / Details of iceberg showing grooves created by rising air bubbles, summer season, near Saint Anthony, Newfoundland, Canada

Yva Momatiuk & John Eastcott / Details of iceberg showing grooves created by rising air bubbles, summer season, near Saint Anthony, Newfoundland, Canada

Stefan Christmann / Emperor penguins (Aptenodytes forsteri) jumping out of the water onto sea ice with a tunnel of water trailing from its tail. This indicates that this bird has just released bubbles of air which were t...

Eric Baccega / Strokkur Geyser erupting. Air bubbles bloat the expanding top of the Geyser just before it erupts. This geyser erupts every 4 to 8 minutes. Geysir, Selfoss, Iceland. September, 2023.

Eric Baccega / Strokkur Geyser erupting. Air bubbles bloat the expanding top of the Geyser just before it erupts. This geyser erupts every 4 to 8 minutes. Geysir, Selfoss, Iceland. September, 2023.

Eric Baccega / Strokkur Geyser erupting. Air bubbles bloat the expanding top of the Geyser just before it erupts. This geyser erupts every 4 to 8 minutes. Geysir, Selfoss, Iceland. September, 2023.

Tui De Roy / Bull Galapagos sea lion (Zalophus wollebaeki) releasing air bubbles underwater. Galapagos Islands, Ecuador. Pacific Ocean.

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) releasing air bubbles underwater. Galapagos Islands, Ecuador Pacific Ocean.

Henley Spiers / Air bubbles erupting from sediment on the riverbed, River Otter, Devon, England, UK. April.

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) releasing air bubbles near water surface, San Cristobal Island, Galapagos, South America, Pacific Ocean.

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki), bull, releasing air bubbles, San Cristobal Island, Galapagos, South America, Pacific Ocean.

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) releasing air bubbles underwater, Floreana Island, Galapagos, South America, Pacific Ocean.

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) yearling pup playing withg own air bubbles in shallows, Gardner Islet, Espanola Island, Galapagos, Ecuador

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) yearling pup playing with own air bubbles in shallows, Gardner Islet, Espanola Island, Galapagos, Ecuador

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) yearling pup playing withg own air bubbles in shallows, Gardner Islet, Espanola Island, Galapagos, Ecuador

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) yearling pup playing withg own air bubbles in shallows, Gardner Islet, Espanola Island, Galapagos, Ecuador

Tony Wu / Tri-spine horseshoe crab (Tachypleus tridentatus) pair on sea floor at night. Female digging before depositing eggs, disturbance releases air bubbles from substrate. Male clasped onto rear of female w...

Tony Wu / Tri-spine horseshoe crab (Tachypleus tridentatus) pair on sea floor at night. Female digging before depositing eggs, disturbance releases air bubbles from substrate. Male clasped onto rear of female w...

Tony Wu / Rear view of a male Humpback whale (Megaptera novaeangliae australis) engaged in a dominance display by blowing a stream of air bubbles. Visible in the top left background is a female humpback whale....