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

Alex Mustard / 2020VISION / Children enjoying dipping in rockpools at low tide in Falmouth, Cornwall, England, UK, July, all model released

Alex Mustard / 2020VISION / Looking up through water at boy dipping in a rock pool with a shrimping net. Falmouth, Cornwall, England, UK. Model released, July

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

Bertie Gregory / 2020VISION / Two boys rock pooling with nets, Falmouth, Cornwall, England, UK, July. Model released

Ross Hoddinott / Godrevy Lighthouse at sunset, seen through rocksand rockpool in the foreground. Nr Hayle, Cornwall, UK, June 2009

Floris van Breugel / Giant Red Sea Urchins (Strongylocentrotus franciscanus) Purple sea urchins (Strongylocentrotus purpuratus) and Sea Anenomes (Anthopleura) underwater, in tide pools along Californian coastline, USA.

Nick Upton / Rock cook / Small mouthed wrasse (Centrolabrus exoletus) caught in a rock pool on a low tide, being taken out of a fishing net. Cornwall, UK.

Dan Burton / Young girl fishing in a tidepool on Exmouth Beach, Devon, UK, September 2009, Model released.

Dan Burton / Children checking their bucket for animals caught in a tidepool on Exmouth Beach, Devon, UK, September 2009, Model released.

Adrian Davies / Enteromorpha (Enteromorpha intestinalis) seaweed in rock pool, Devon, England, UK, July.

Adrian Davies / Enteromorpha (Enteromorpha intestinalis) seaweed in rock pool, Devon, England, UK, July.

Floris van Breugel / Tide pool full of Giant green anemones (Anthopleura xanthogrammica) at low tide, Olympic National Park, Washington, USA, March.

Nick Upton / Wide angle view of Rayed trough shell (Mactra stultorum), partially buried in sand with siphons visible exposed on a low spring tide, with the sea in the background, Rhossili, The Gower peninsula, Wal...

Nick Upton / Rayed trough shell (Mactra stultorum), partially buried in sand with siphons visible exposed on a low spring tide. Rhossili, The Gower peninsula, Wales, UK, July.

Nick Upton / Snakelocks anemone (Anemonia viridis) among Coralweed (Corallina officinalis) ejecting remains of its prey, a mussel shell. Rhossili, The Gower Peninsula, July.

Nick Upton / Snakelocks anemone (Anemonia viridis) attached to a boulder alongside Coralweed (Corallina officinalis) and Flat / Purple top shells (Gibbula umbilicalis) in a rockpool, Rhossili, The Gower Peninsula,...

Nick Upton / Snakelocks anemone (Anemonia viridis) filter feeding in a rockpool, with closed Beadlet anemone (Actinia equina) in the background. Rhossili, The Gower Peninsula, July.

Nick Upton / Shore crab (Carcinus maenas) in defensive posture with claws raised in crevice under Coralweed (Corralina officinalis). Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Sea slater / Beach woodlouse (Ligia oceanica) on pebbles. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Sea slater / Beach woodlouse (Ligia oceanica) on pebbles. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Frosty sea mat (Electra pilosa) bryozoan colony growing on frond of Dulse (Palmaria palmata) red alga exposed on a low spring tide. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Close up of Frosty sea mat (Electra pilosa) bryozoan colony growing on frond of Dulse (Palmaria palmata) red alga exposed on a low spring tide. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Sea lettuce / Green laver (Ulva lactuca) growing in a rockpool alongside Coralweed (Corallina officinalis). Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Sea lettuce / Green laver (Ulva lactuca) growing in a rockpool alongside Coralweed (Corallina officinalis). Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Sand hopper / Beach hopper (Talitrus saltator) on pebble beach. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) entangled with Coralweed (Corallina officinalis) in a rockpool. Rhossil...

Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) entangled with Coralweed (Corallina officinalis) in a rockpool. Rhossil...

Nick Upton / Yolk and developing embryo visible in Mermaid's purse egg case of Lesser spotted catshark / Dogfish (Scyliorhinus canicula) entangled with Coralweed (Corallina officinalis) in a rockpool. Rhossil...

Nick Upton / Head on view of Common Hermit crab (Pagurus bernhardus) in a Dog whelk shell crawling over floor of a rockpool. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Bristled chiton (Acanthochitona crinitus) attached to rocks exposed at low tide, Rhossili, The Gower Peninsula, UK, July.

Nick Upton / Close up views of Spiral / Flat wrack (Fucus spiralis) surrounded by Channelled wrack (Pelvetia canaliculata) on rocks high on the shoreline, exposed at low tide, Rhossili, The Gower Peninsula, UK, Ju...

Nick Upton / Cushion star (Asterina gibbosa) exposed on a low spring tide on rocks among barnacles (Verruca stroemia) and holdfasts of Tangleweed kelp (Laminaria digitata), near Falmouth, Cornwall, UK, August.

Nick Upton / Shoal of Atlantic herring fry (Clupea harengus) swimming in a rockpool past kelp fronds and reflecting the red colour of Harpoon weed (Asparagopsis armata), near Falmouth, Cornwall, UK, August.

Nick Upton / Broad-clawed porcelain crab (Porcellana platycheles) hiding in a rockpool among Mussels (Mytilus edulis) and Gutweed (Ulva / Enteromorpha intestinalis), near Falmouth, Cornwall, UK, August.

Nick Upton / Shoal of Atlantic herring fry (Clupea harengus) swimming in a rockpool past kelp fronds (Laminaria sp.), near Falmouth, Cornwall, UK, August.

Nick Upton / Gutweed (Ulva intestinalis / Enteromorpha intestinalis) growing in a rockpool high on the shore, with buoyant tubular fronds filled with air standing upright, Wembury, Devon, UK, August.

Nick Upton / Brown seaweed (Bifurcaria bifurcata), an alga that has shown some anti-cancer properties, growing in a rockpool low on the shore alongside Coralweed (Corallina officinalis), Wembury, Devon, UK, August...

Nick Upton / Sponge spider crab (Inachus sp.) covered in red sponge in a rockpool low on th shore alongside a group of Light bulb sea squirts (Clavellina lepadiformis), Helford River, Cornwall, UK, August.

Nick Upton / Split level view of Spiny starfish (Marthasterias glacialis) among kelp just below the waterline on a low spring tide, Wembury, Devon, UK, August.

Nick Upton / Common brittle star (Ophiothrix fragilis) moving over floor of rockpool encrusted with red algae (Lithothamnion sp.), near Falmouth, Cornwall, UK, August.

Nick Upton / Broad-clawed porcelain crab (Porcellana platycheles) among encrusting red algae (Lithothamnion sp.) in a rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Spiral egg ribbon of a sea slug (probably Haminoea navicula) attached to a boulder in a rockpool alongside Star ascidians (Botryllus schlosseri), Bryozoans, Barnacles and Red algae low on the shore, H...

Nick Upton / Broad-clawed porcelain crab (Porcellana platycheles) well camouflaged among Coralweed (Corallina officinalis) and encrusting red algae (Lithothamnion sp.) in a rockpool low on the shore, near Falmouth...

Nick Upton / Green / Purple-tipped sea urchin (Psammechinus miliaris) in a rockpool low on the shore, near Falmouth, Cornwall, UK, August.

Nick Upton / Squat lobster (Galathea squamifera) on the move with its claws raised in a rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Head on view of Squat lobster (Galathea squamifera) in a rockpool low on the shore among mix of red, green and brown algae, near Falmouth, Cornwall, UK, August.

Nick Upton / Shoal of Atlantic herring fry (Clupea harengus) swimming in a rockpool past kelp fronds, near Falmouth, Cornwall, UK, August.

Nick Upton / Common brittle star (Ophiothrix fragilis) well camouflaged among mix of red and green algae including Coralweed (Corallina officinalis), Harpoon weed (Asparagopsis armata) and Sea lettuce (Ulva lactuc...

Nick Upton / Group of Light bulb sea squirts (Clavelina lepadiformis) in rockpool low on the shore, Helford River, Cornwall, UK, August.

Nick Upton / Rockpool high on a rocky shore fringed with Gutweed (Ulva intestinalis / Enteromorpha intestinalis), Wembury, Devon, UK, August.

Nick Upton / Green / Purple-tipped sea urchin (Psammechinus miliaris) wth some fragments of stone held by its tube feet, near Falmouth, Cornwall, UK, August.

Nick Upton / Variegated scallop (Chlamys varia) filter feeding with its valves partly open while attached to a boulder in a rockpool low on the shore, with a Common limpet (Patella vulgata) in the background, near...

Nick Upton / Cushion star (Asterina gibbosa) on the move over submerged rocks low on the shore among a mix of red algae including Coralweed (Corallina officinalis) and Sea horsetail (Halurus equisetifolus) submerg...

Nick Upton / Variegated scallop (Chlamys varia) attached to a boulder in a rockpool low on the shore, with a Common limpet (Patella vulgata) in the background, near Falmouth, Cornwall, UK, August.

Nick Upton / Broad-clawed porcelain crab (Porcellana platycheles) well camouflaged among red algae in a rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) hiding behind green algae, near Falmouth, Cornwall, UK, August.

Nick Upton / Squat lobster (Galathea squamifera) in a rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Semi-transparent Scale worm (Alentia gelatinosa) on the move over encrusting red algae (Lithothamnion sp.) in rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Common brittle star (Ophiothrix fragilis) moving over floor of rockpool encrusted with red algae (Lithomnanion sp.) past Flat / Purple Top shell (Gibbula umbilicalis) low on a rocky shore, near Falmou...

Nick Upton / Split level view of a group of Common limpets (Patella vulgata) on the move on intertidal rocks about to be exposed by a falling tide, alongside a clump of Toothed wrack (Fucus serratus), near Falmout...

Nick Upton / Four Sea squirts (Ascidiella scabra) attached to boulder in a rockpool alongside serpulid worm tubes, Bryozoans, Barnacles and Red algae low on the shore, Helford River, Cornwall, UK, August.

Nick Upton / Three Common limpets (Patella vulgata) on the move on intertidal rock submerged at mid tide, Falmouth, Cornwall, UK, August.

Nick Upton / Submerged Star ascidian colony (Botryllus schlosseri) attached to boulder in a rockpool, Helford River, Cornwall, UK, August.

Nick Upton / Gametophyte of Harpoon weed (Asparagopsis armata), an invasive red alga attached with barbed branchlets to Sea lettuce (Ulva lactuca) in a rockpool low on the shore, near Falmouth, Cornwall, UK, Augus...

Nick Upton / Split level view of a shoal of Atlantic herring fry (Clupea harengus) swimming in a rockpool past kelp fronds (Laminaria sp.), near Falmouth, Cornwall, UK, August.

Nick Upton / Broad-clawed porcelain crab (Porcellana platycheles) hiding behind Gutweed (Ulva / Enteromorpha intestinalis) in a rockpool alongide a Flat / Purple top shell (Gibbula umbilicalis) and a Limpet (Patel...

Nick Upton / Shoal of Atlantic herring fry (Clupea harengus) swimming in a rockpool past kelp fronds and Harpoon weed (Asparagopsis armata), near Falmouth, Cornwall, UK, August.

Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) in rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Common brittle star (Ophiothrix fragilis) moving over floor of rockpool encrusted with red algae past Flat / Purple Top shell (Gibbula umbilicalis) low on a rocky shore, near Falmouth, Cornwall, UK, A...

Nick Upton / Batters / Sea noodle (Nemalion helminthoides) seaweed growing on rocks encrusted with Common barnacles / Northern rock barnacles (Semibalanus balanoides) and Black-footed limpets (Patella depressa) lo...

Nick Upton / Spiny starfish (Marthasterias glacialis) among Toothed wrack (Fucus serratus) in a rockpool low on the shore, near Falmouth, Cornwall, UK, August.

Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) in rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Common brittle star (Ophiothrix fragilis) moving over floor of rockpool encrusted with red algae past Common periwinkles (Littorina littorea) and Flat / Purple Top shell (Gibbula umbilicalis) low on a...

Nick Upton / Gutweed (Ulva intestinalis / Enteromorpha intestinalis) growing in a rockpool high on the shore, with buoyant tubular fronds filled with air standing upright, Wembury, Devon, UK, August.

Nick Upton / Spiny starfish (Marthasterias glacialis) among Toothed wrack (Fucus serratus) in a rockpool low on the shore, near Falmouth, Cornwall, UK, August.

Nick Upton / Sponge spider crab (Inachus sp.) covered in red sponge in a low shore rockpool alongside other sponges and some Light bulb sea squirts (Clavellina lepadiformis), Helford River, Cornwall, UK, August.

Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) in rockpool, near Falmouth, Cornwall, UK, August.

Nick Upton / Common Starfish (Asterias rubens) moving over a boulder encrusted with sponges, serpulid worms and sea squirts in a rockpool low on the shore, Helford River, Cornwall, UK, August.

Nick Upton / Red hornweed (Ceramium virgatum) growing in a rockpool low on the shore alongside Coralweed (Corallina officinalis) and Sea lettuce (Ulva lactuca), Wembury, Devon, UK, August.

Nick Upton / Dahlia anemone (Urticina felina) with yellow striped tentacles and Cushion star (Asterina gibbosa) in a rockpool low on the shore near Falmouth, Cornwall, UK, August.

Nick Upton / Common brittle star (Ophiothrix fragilis) moving over floor of rockpool encrusted with red algae (Lithomnanion sp.), near Falmouth, Cornwall, UK, August.

Nick Upton / Brown seaweed (Bifurcaria bifurcata), an alga that has shown some anti-cancer properties, growing in a rockpool low on the shore alongside Coralweed (Corallina officinalis), Wembury, Devon, UK, August...

Nick Upton / Gutweed (Ulva intestinalis / Enteromorpha intestinalis) growing in a rockpool high on the shore, with buoyant tubular fronds filled with air standing upright, Wembury, Devon, UK, August.

Nick Upton / Four Sea squirts (Ascidiella scabra) attached to boulder in a rockpool alongside serpulid worm tubes, Star ascidians, Bryozoans, Barnacles and Red algae low on the shore, Helford River, Cornwall, UK,...

Nick Upton / Squat lobster (Galathea squamifera) in a rockpool low on the shore among mix of red, green and brown algae alongside a well camouflaged Common prawn (Palaemon serratus) near Falmouth, Cornwall, UK, Au...

Nick Upton / Irish moss / Carrageen (Chondrus crispus) iridescing in a sunlit rockpool, Rhossili, The Gower peninsula, UK, July.

Nick Upton / Common Blenny / Shanny (Lipophrys pholis) hiding under Coralweed (Corallina officinalis) in a rockpool near a Common / Edible periwinkle (Littorina liitorea), Rhossili, The Gower peninsula, UK, July.

Nick Upton / Common Blenny / Shanny (Lipophrys pholis) hiding under Coralweed (Corallina officinalis) in a rockpool near a Common / Edible periwinkle (Littorina liitorea), Rhossili, The Gower peninsula, UK, July.

Nick Upton / Limestone rocks, boulders and rockpool exposed at low tide with steep eroded cliffs above, near Rhossili, The Gower peninsula, Wales, UK, July. Sequence 1 of 2, matching view with different tides

Nick Upton / Overview of the Worm's head with causeway connecting it to the mainland exposed at low tide, with wave cut platform and rockpools visible, Rhossili, The Gower peninsula, Wales, UK, July. Sequence 1 of...

Nick Upton / Close up of Velvet horn / Spongeweed (Codium tomentosum) branching fronds growing on rocks low on the shore, Wembury, Devon, UK, August.

Nick Upton / Velvet horn / Spongeweed (Codium tomentosum) clump growing on rocks low on the shore, Wembury, Devon, UK, August.

Nick Upton / Colourful mix of Bushy rainbow wrack (Cystoseira tamariscifolia) with turquoise iridescent tips to its fronds and red Harpoon weed (Asparagopsis armata) surrounded by Coralweed (Corallina officinalis)...

Nick Upton / Colourful mix of Bushy rainbow wrack (Cystoseira tamariscifolia) with blue iridescent tips to its fronds and red Harpoon weed (Asparagopsis armata) surrounded by Coralweed (Corallina officinalis) Furb...