Linda Pitkin / 2020VISION / River Itchen, with aquatic plants reflected in the surface. Blunt-fruited Water-starwort (Callitriche obtusangula). Ovington, Hampshire, England, May.

Linda Pitkin / 2020VISION / Split level view of the River Itchen, with aquatic plants: Blunt-fruited Water-starwort (Callitriche obtusangula). Itchen Stoke Mill is visible on the left. Ovington, Hampshire, England, May.

Linda Pitkin / 2020VISION / Aquatic plants in River Itchen: Blunt-fruited Water-starwort (Callitriche obtusangula), and Stream Water-crowfoot (Ranunculus penicillatus subsp. pseudofluitans). Ovington, Hampshire, England, May.

Laurie Campbell / Common / Harbour Seal (Phoca vitulina) bottling / sleeping upright in water and moored in bed of sea thong weed, Islay, Scotland, April

Juergen Freund / Sargassum seaweed (Sargassum sp) floating on the sea surface, Palawan, Philippines, May

Solvin Zankl / Lars Hendrickson watching Black piston water beetles (Hydrophilus aterrimus) feeding on a tadpole, State Collection in Munich, Germany, June

Pete Oxford / Butterfly peacock bass (Cichla ocellaris) in permanent freshwater pond, savannah, Rupununi, Guyana

Alex Mustard / Two Atlantic spotted dolphins (Stenella frontalis) over a shallow sand bank. On the left is a juvenile which does not have the characteristic spots of the adults. The adult is carrying a piece of weed...

Fabio Liverani / Crested Newt (Triturus cristatus carnifex) underwater view of female swimming near surface, Traversari lake, Campigna National Park, Emilia Romagna and Tuscany regions, Italy

Graham Eaton / Snake Pipefish (Entelurus aequoreus) head portrait in profile in weed, Cardigan Bay, Wales, May.

Michel Roggo / Underwater landscape in spring creek, Croatia, May

Michel Roggo / Underwater landscape in spring creek, Croatia, May