Wim van den Heever / Blue wildebeest (Connochaetes taurinus) leaping into Mara River, Masai Mara, Kenya.
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Ashley Cooper / Woman taking polar plunge in 2 degrees C water off an Antarctic cruise ship into sea. Antarctic Peninsula, Antarctica. February 2019.
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John Chan / Caspian tern (Hydroprogne caspia) plunge diving near a group of Elegant terns (Thalasseus elegans) gathering at breeding grounds, Southern California, USA, March.
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Andy Rouse / Polar bear (Ursus arctos) getting ready to enter water, Svalbard, Norway.
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Matthew Maran / Swimmer about to dive into the cold water of the Men's Pond, Hampstead Heath, London, England, UK. January 2016.
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Bryan and Cherry Alexander / Tourists and Russian crew from icebreaker "Sovetskiy Soyuz" taking part in the 'Polar Plunge' when they reach the North Pole, 1998.
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Tui De Roy / Blue-footed Booby (Sula nebouxii) emerging from water after plunge dive, Itabaca Channel, Santa Cruz Island, Galapagos Islands, Ecuador
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Franco Banfi / Woman taking the 'Polar plunge' from the side of a cruise ship. Polar plunging is a popular activity with cruise ship visitors to the polar regions, Prospect Point, Antarctic Peninsula, Ant...