Jurgen Freund / Seastars in tide pool split level {Asteroidea} Canadian pacific coast

Shane Gross / Lemon shark juvenile (Negaprion brevirostris) swimming in mangrove habitat near blue crab (Callinectes sapidus), a prey species for the shark. Eleuthera, Bahamas.

Shane Gross / Lemon shark juvenile (Negaprion brevirostris) trying to feed on the leaves of a red mangrove (Rhizophora mangle). As pups, the sharks have to learn to hunt for themselves and sometimes make mistakes....

Ross Hoddinott / Westward Ho! beach at sunrise, colourful sky at low tide and tidal pool, north Devon, UK. February.

Jack Dykinga / Patterns in the tidal flats of the delta where the delta is swept by tidal encroachment from the Gulf of California. Evidence of the fresh water flow is observable as plant life turns green. Colorado...

John Chan / American avocet (Recurvirostra americana) foraging in salt marsh, Southern California, USA.

John Shaw / Brown bear (Ursus arctos) searching for clams on tidal mudflat with waterbirds. Lake Clark National Park, Alaska. August.

Pedro Narra / Aerial view of low tide in Sado estuary, Portugal. November

Guy Edwardes / Gatklettur, Arnarstapi, Snaefellsnes Peninsula, Iceland, March 2017.

Guy Edwardes / Saltmarsh. Isle of Harris, Scotland, UK. March, 2015.

Guy Edwardes / Luskentyre beach with three people wading in water, Isle of Harris, Outer Hebrides, Scotland, UK. June 2012.

Guy Edwardes / Saltmarsh on the Isle of Harris, Outer Hebrides, Scotland, UK. November 2016.

Guy Edwardes / Rock formations at Kimmeridge Bay, Clavell Tower in background, Isle of Purbeck, Jurassic Coast, Dorset, England, UK. December 2010.

Dave Bevan / Grey plover (Pluvialis squatarola) eating a marine flatworm, Norfolk, England, UK, February.

Benjamin Barthelemy / Long exposure of tidal water flowing off rocks, with the Okshornan Mountains in the background, Isle of Senja, Troms, Norway, February 2015.

Ernie Janes / Low tide on the Wash, Snettisham, Norfolk, England, UK, February.

Ole Jorgen Liodden / Marine iguana (Amblyrhynchus cristatus) silhouetted on the coast at sunset, Galapagos.

Erlend Haarberg / Rorbu houses in front of Festhelltinden mountain, Hamnoy, Moskenes, Lofoten, Norway, December.

Nick Upton / Timelapse of a Common starfish (Asterias rubens) moving in a rockpool, speeded up four times, Cornwall, England, UK, September.

Nick Upton / Common starfish (Asterias rubens) moving in a rockpool, real time, Cornwall, England, UK, September.

Nick Upton / Common prawns (Palaemon serratus) and a Rock goby (Gobius paganellus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Rock goby (Gobius paganellus) stealing food from a scavenging Common prawn (Palaemon serratus) in a rockpool, Cornwall, England, UK, September.

Hougaard Malan / Lighthouse at sunset. Kommetjie, Cape Town, South Africa. November 2008.

Hougaard Malan / Large wave crashing against rock shelf. Luphathana, Pondoland, Eastern Cape, South Africa. June 2012.

Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) females coming ashore at twilight during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.

Benjamin Barthelemy / Landscape view of the Devil's Jaw, Ersfjord, Senja, Norway, February.

Peter Cairns / Reynisdrangar sea stacks at dusk, Vik, Iceland

Ernie Janes / Holkham beach at low tide, Norfolk, UK August

Jack Dykinga / Shore Acres State Park with sandstone bluffs being pounded by tidal shifting surf, creating waterfalls over concretions in the stone. Oregon

Andy Rouse / 2020VISION / Redshank (Tringa totanus) foraging on tidal flats. Liverpool Bay, UK, December.

Alex Hyde / Shore Crab (Carcinus maenas) against white background. From the Isle of Skye, Inner Hebrides, Scotland, UK.

Alex Hyde / Sea Scorpion / Bullfish (Taurulus bubalis) against white background. From the Isle of Skye, Inner Hebrides, Scotland, UK.

Alex Hyde / Various rockpool animals and seaweeds, photographed on a white background. Isle of Skye, Inner Hebrides, Scotland, UK, March. Digital composite.

Nick Upton / Split level view of a Beadlet anemone (Actinia equina) attached to a boulder encrusted with Maerl (Lithothamnion glaciale) a red coralline alga, in a large rockpool, Crail, Scotland, UK, July

David Tipling / 2020VISION / Bar-tailed Godwit (Limosa lapponica) foraging for tidal-flat worm. Norfolk, January. Sequence 2 of 2.

David Tipling / 2020VISION / Bar-tailed Godwit (Limosa lapponica) foraging for tidal-flat worm. Norfolk, January. Sequence 1 of 2.

Terry Whittaker / 2020VISION / View of saltmarsh habitat from the air, showing tidal creek system, Abbotts Hall Farm, Essex, England, UK, March. 2020VISION Book Plate.

Ben Hall / Sanderlings (Calidris alba) group feeding on beach with sunrise on the horizon, Lincolnshire, UK December

Ben Hall / Curlews (Numenius arquata) group flying over the sea during storm. Wales, UK December. Highly commended, 'Habitat' division, British Wildlife Photography Awards (BWPA) competition 2012.

Ernie Janes / Cley Beach with retreating wave patterns, after sunset, Norfolk, UK January

Bertie Gregory / 2020VISION / Young boys playing, putting seaweed on their heads whilst rockpooling, Falmouth, Cornwall, England, UK, July 2011 Model released

Chris Gomersall / 2020VISION / Flock of dark-bellied brent geese (Branta bernicla) on foreshore, Snettisham RSPB reserve, The Wash, Norfolk, England, UK, January 2012

Chris Gomersall / 2020VISION / Dark-bellied brent goose (Branta bernicla) feeding on shore just after high water, The Wash, Norfolk, England, UK, January 2012

Chris Gomersall / 2020VISION / Grey plover (Pluvialis squatarola) adult in winter plumage on mudflats, The Wash, Norfolk, England, UK, December

Chris Gomersall / 2020VISION / Black-tailed godwit (Limosa limosa) adult in winter plumage feeding on mudflats, The Wash, Norfolk, England, UK, December

Chris Gomersall / 2020VISION / Black-tailed godwit (Limosa limosa) adult in winter plumage feeding on mudflats, The Wash, Norfolk, England, UK, December

Chris Gomersall / 2020VISION / Sanderling (Calidris alba) in winter plumage feeding on tideline, The Wash, Norfolk, March. Did you know? The Sanderling is the only British wading bird that has no back toe; this gives it a distincti...

Chris Gomersall / 2020VISION / Common redshank (Tringa totanus) in winter plumage, feeding on mudflats, The Wash, Norfolk, England, UK, March