SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a horse mussel bed (Modiolus modiolus) Shetland, Scotland, UK, August.

Claudio Contreras / American crocodile (Crocodylus acutus) rear view of animal swimming away over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) split level with animal resting at surface in shallow water over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Cheryl-Samantha Owen / Recreational fishing in a sea kayak for West coast rock lobster (Jasus lalandii). Hoop net or trap is lowered onto the sea floor or kelp bed with a pouch of bait (sardines or pilchards) attached. Kom...

Jeff Rotman / Northern Sea Stars (Asterias vulgaris) feeds on bed of mussels. Cathedral Rocks, Gloucester, Massachusetts, New England USA - North Atlantic Ocean.

Claudio Contreras / Green Seaturtle (Chelonia mydas) in profile above sandy shallow sea bed. Endangered, Cancun National Park, Caribbean Sea, Mexico.

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

Linda Pitkin / 2020VISION / Dahlia anemone (Urticina felina / Tealia felina), on bed of Common brittlestars (Ophiothrix fragilis), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, August 2011

Linda Pitkin / 2020VISION / Black brittlestar (Ophiocomina nigra), yellow colour variety, with Common brittlestars (Ophiothrix fragilis), on sea bed, St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotlan...

Juergen Freund / Dusky garden eels (Heteroconger enigmaticus) feeding on sandy seabed, Indonesia.

Juergen Freund / Sea pens (Virgularia sp) on sandy seabed, Palawan, Philippines.

Juergen Freund / Snowflake moray eel (Echidna nebulosa) hunting over sea rubble, West Papua, Indonesia.