Marie Read / Horned Puffin (Fratercula corniculata) flying over a pattern of kelp and sea foam, photographed from above, St. Paul, Pribilof Islands, Alaska, USA. July.

Theo Bosboom / Maple leaf in autumn, viewed from underwater with bubbles and foam of mountain stream, La Hoegne, Ardennes, Belgium.

Theo Bosboom / Yellow coloured Birch leaf (Betula) floating on the bubbles and foam of a stream, De Veluwe (Leuvenumse bos), Netherlands.

Ross Hoddinott / Foam on beach below cliffs at Burton Bradstock, late evening light, Dorset, UK. November 2016.

Mark Taylor / Waves breaking against sea wall and cliffs, Seaford, Sussex, England, UK, 15th February 2014.

Ole Jorgen Liodden / Fiordland crested penguin (Eudyptes pachyrhynchus) in foamy waves, Vulnerable species, Westland, New Zealand, November

Ole Jorgen Liodden / Fiordland crested penguin (Eudyptes pachyrhynchus) being splashed by foam from surf, Westland, New Zealand, Vulnerable species. November.

Luis Quinta / Abstract image of large sea swells hitting the rocks, Portuguese southwestern coast, Portugal, March, 2010.

Mark Hamblin / 2020VISION / Swirling foam patterns in the River Sligachan, with Marsco in background, Isle of Skye, Inner Hebrides, Scotland, UK, October 2010

Mark Hamblin / 2020VISION / Fallen Silver birch leaves (Betula sylvestris) and foam swirling in river eddy, Glen Affric, Highland, Scotland, UK, February

Wild Wonders of Europe / della Ferrera / Whirl pool with foam (from waterfall) or pollution floating on surface, Trebizat River, near the Kravice Falls, Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Biancarelli / Foam and dead leaves in motion on the water surface of a pool with Beech (Fagus sp) leaves hanging down from above, Plitvice National Park, Croatia, October 2008