Ernie Janes / Boat full of people watching Common Seals (Phoca vitulina) on sand bank at Blakeney Point, Norfolk, August 2013.

Peter Cairns / 2020VISION / Group of tourists wearing waterproof clothing and life jackets photograph seabirds from zodiac boat on tour around Bass Rock, North Berwick, Firth of Forth, Lothian, Scotland, UK, August 2011

Peter Cairns / 2020VISION / Group of tourists wearing waterproof clothing and life jackets photograph Gannet colony from zodiac boat on tour around Bass Rock, North Berwick, Firth of Forth, Lothian, Scotland, UK, August 2011. Di...

Peter Cairns / 2020VISION / Group of tourists wearing waterproof clothing and life jackets in zodiac boat for seabird safari tour around Bass Rock, North Berwick, Firth of Forth, Lothian, Scotland, UK, August 2011

Ashley Cooper / Antarctic cruise boats moored in the town of Ushuaia, Tierra del Fuego, Argentina. February 2014.

Kirkendall-Spring / Lava tour boats getting very close to lava flowing into the Pacific Ocean from the East Riff Zone of the Kilauea Volcano, Hawaii. December 2016.

Mark Carwardine / Aerial view of tourists watching a Grey whale (Eschrichtius robustus) from a boat, San Ignacio Lagoon, Baja California, Mexico, 2017.

Mark Carwardine / Aerial view of tourists watching a Grey whale (Eschrichtius robustus) from a boat, San Ignacio Lagoon, Baja California, Mexico, 2017.

Doug Perrine / Aerial view of southern Belize barrier reef near Placencia, showing reef bend at Gladden Spit, Gladden Spit and Silk Cayes Marine Reserve. With two tour boats inside the reef, and three fishing boats...

Ingo Arndt / Tourists on tour boats for Humpback whale watching (Megaptera novaeangliae), near Juneau, Alaska, 2008

Nick Upton / Seal watching tour boat approaching three adult Grey seals (Halichoerus grypus) resting on offshore rocks at low tide, as another swims nearby, The Carracks, St.Ives, Cornwall, UK, June.

Cyril Ruoso / Whale watching tour boat with Killer whale (Orcinus orca) surfacing, Husavik, Iceland. September 2003.