Ernie Janes / Looking across countryside to villages of Cley and Wiveton from Wiveton Downs, North Norfolk, UK, April 2012. Free-range pig unit in foreground and sea in distance,

Nick Upton / Common periwinkles (Littorina liitorea) alongside yellow and brown Rough periwinkles (Littorina saxatilis) nestled in a crevice in sandstone rocks at low tide, Crail, Fife, July

Nick Upton / Common periwinkles (Littorina liitorea) alongside yellow and brown Rough periwinkles (Littorina saxatilis) nestled in a crevice in sandstone rocks at low tide, Crail, Fife, July

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae), portrait. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July. Endangered.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae), feeding on mangoes. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July. Endangered.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae) in foliage. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June. Endangered.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June. Endangered.

Chris Newbert / Starfish skin, Indonesia

Chris Newbert / Candy Cane Sea Star (Fromia monilis) skin, Indonesia

Alex Mustard / Secretary blenny (Acanthemblemaria maria) emerging from its tube home in the reef that is covered in a colonial overgrowing Tunicate (Trididemum solidum) East End, Grand Cayman, Cayman Islands, Britis...

Alex Mustard / Secretary blenny (Acanthemblemaria maria) peering out from a hole in the reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Secretary blenny (Acanthemblemaria maria) young peering out of its tube on the surface of a great star coral (Montastraea cavernosa) East End, Grand Cayman, Cayman Islands, British West Indies. Caribb...

Alex Mustard / Diver photographing a large formation of yellow tube sponges (Aplysina fistularis) growing on a coral reef, North Wall, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea. Model released...

Claudio Contreras / Spanish Hogfish (Bodianus rufus), a wrasse. Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Queen Angelfish (Holacanthus ciliaris). Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Rock Beauty (Holacanthus tricolor). Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Rock Beauty (Holacanthus tricolor). Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Spanish Hogfish (Bodianus rufus), a wrasse. Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Blue Angelfish (Holacanthus bermudensis) juvenile, Cancun National Park, Caribbean Sea, Mexico.

David Shale / Close up of Sea pen (Pennatulacea) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

Adrian Davies / Tree spurge (Euphorbium dendroides) growing on sea cliffs near ancient lookout tower, Torre del Verger, Mallorca, March 2012.

Orsolya Haarberg / Aerial view of man and woman kayaking on the sea, Husvaer, Heroy, Helgeland, Nordland, Norway, August 2008

Ernie Janes / Yellow Labrador in action along the beach, UK

Ernie Janes / Yellow Labrador in action along the beach, UK

Ernie Janes / Yellow Labrador in action along the beach, UK

Nick Upton / Parasite fly / Tachinid fly (Gymnosoma sp) a parasitoid of Shield bugs, feeding on Rock samphire / Sea Fennel flowers (Crithmum maritimum) Samos, Greece, August.

Nick Upton / Pink / Hairy rock rose (Cistus incanus) flowering on the coast, with the sea in the background, Lesbos / Lesvos, Greece, May.

Nick Upton / Spanish broom (Spartium junceum) flowering in coastal sand dunes, Lesbos / Lesvos Greece, May.

Nick Upton / Potter wasp / Mason wasp (Eumenes mediterraneus) feeding on Rock samphire / Sea Fennel flowers (Crithmum maritimum) by the coast, Samos, Greece, August.

Nick Upton / Spanish broom (Spartium junceum) flowering in coastal sand dunes, Lesbos / Lesvos Greece, June.

Nick Upton / Yellow horned poppy (Glaucium flavum) flowering with the Aegean Sea and the coast of Turkey in the background, Eftalou, Lesbos / Lesvos, Greece, May.

Nick Upton / Yellow horned poppy (Glaucium flavum) flowering with the Aegean Sea and the coast of Turkey in the background, Eftalou, Lesbos / Lesvos, Greece, May.

Nick Upton / Sea spurge (Euphorbia paralias) clump flowering in coastal sand dunes behind beach, Lesbos / Lesvos Greece, June.

Nick Upton / Spanish broom (Spartium junceum) flowering in coastal sand dunes, Lesbos / Lesvos Greece, June.

MYN / Mac Stone / Small spine sea stars (Echinaster spinulosus) in various stages of growth, Florida, USA, September. meetyourneighbours.net project

Alex Mustard / Roughhead blenny (Acanthemblemaria aspera) high magnification portrait of a golden variety of living in it's tube on a coral reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbea...

Alex Mustard / Brown tube sponges (Agelas conifera) formation on a reef wall, with sun shining through the water and diver above, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / A pair of sponges (Porifera) at the base of a pinnacle off the main reef wall with diver in background, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Grey angelfish (Pomacanthus arcuatus) pair browsing along the reef between red rope sponges (Aphimedon compressa) with diver above, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbe...

Alex Mustard / A bustling coral reef scene with sponges (Agelas conifera; Amphimedon compressa) soft and hard corals and a school of Creole wrasse (Clepticus parrae) East End, Grand Cayman, Cayman Islands, British W...

Alex Mustard / Grooved brain coral (Diploria labyrinthiformis) close focus wide angle view, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Brain coral (Colpophyllia natans) showing healthy coral, unmanipulated image. East End, Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Alex Mustard / Brain coral (Colpophyllia natans) probably suffering from white band disease, East End, Grand Cayman, Cayman Islands. British West Indies, Caribbean Sea, January 2010.

Alex Mustard / Diamond blenny (Malacoctenus boehlkei) photographed through a window in a seafan, Grand Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Bluestriped grunt (Haemulon sciurus) school sheltering from the current behind a coral outcrop, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Yellow tube sponge (Aplysina fistularis) selectively illuminated with a diver swimming above, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Rock beauty angelfish (Holacanthus tricolor) swimming through a small arch on a colourful coral reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Sharpnose puffer (Canthigaster rostrata) male displaying bright colours including a bright blue flap on skin on his chin, West Indies, Caribbean Sea.

Alex Mustard / Yellow tube sponge (Aplysina fistularis) on a coral reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Yellow grouper (Epinephelus fulvus) a medium size reef predator, hiding under an overhang, East End, Grand Cayman, Cayman Island, British West Indies, Caribbean Sea.

Alex Mustard / Great star coral (Montastrea cavernosa) male releasing clouds of sperm into the water column, during its synchronised annual spawning event, several hours after sunset in late summer, East End, Grand...

Alex Mustard / Great star coral (Montastrea cavernosa) male releasing clouds of sperm into the water column, during its synchronised annual spawning event, several hours after sunset in late summer, East End, Grand...

Alex Mustard / Grooved brain coral (Diploria labyrinthiformis) close up view, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Spanish hogfish (Bodianus rufus) pair come together to mate at sunset, the larger male courting the female, enticing her away from the reef and into open water to spawn, West Bay, Grand Cayman, Cayman...

Alex Mustard / Shy hamlets (Hypoplectrus guttavarius) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / French angelfish (Pomacanthus paru) pair during courtship with the larger male is rubbing against the swollen abdomen of the smaller female during a spawning rise at dusk. Georgetown, Grand Cayman, Ca...

Alex Mustard / French angelfish (Pomacanthus paru) pair during courtship with the larger male is rubbing against the swollen abdomen of the smaller female during a spawning rise at dusk. Georgetown, Grand Cayman, Ca...

Alex Mustard / Fingerprint cyphoma / false cowrie (Cyphoma signatum) feeding on a sea rod (soft coral) East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Yellowbelly hamlet (Hypoplectrus aberrans) pair spawning at dusk (a long exposure 1/10th produced the blue background) George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Rock beauty (Holacanthus tricolor) pair spawning, with the male rubbing against the flank of the female during the spawning rise, Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbe...

Alex Mustard / Threespot damselfish (Stegastes planifrons) defending its garden of algae, Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Schoolmaster snapper (Lutjanus apodus) resting beneath an overhang, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Fairy basslet (Gramma loretoa) swimming above the reef, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Queen angelfish (Holacanthus ciliaris) portrait, swimming along the edge of a coral reef at dusk, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Shy hamlet (Hypoplectrus guttavarius) pair spawning at dusk. Hamlets are one of the few vertebrate species that are true hermaphrodites, here the fish in the foreground is acting as a male, but this p...

Alex Mustard / Staghorn coral (Acropora cervicornis) spawning at night in late summer, showing the onset of the release of bundles of eggs and sperm, when most of the bundles are still set in the polyps and just a f...

Alex Mustard / Boulder star coral (Montastraea annularis) spawning at night in late summer, showing the onset of the synchronised release of bundles of eggs and sperm with a Ruby brittlestar (Ophioderma iubicundum,...

Alex Mustard / Staghorn coral (Acropora cervicornis) spawning at night in late summer, showing the onset of the release of bundles of eggs and sperm, when most of the bundles are still set in the polyps and just a f...

Alex Mustard / Boulder star coral (Montastraea annularis) spawning at night in late summer, showing the synchronised release of bundles of eggs and sperm being released from the polyps of the coral, East End, Grand...

Alex Mustard / French grunt (Haemulon flavolineatum) Sugar Wreck, Little Bahama Bank, The Bahamas, Caribbean Sea.

Petra Wegner / Cavalier King Charles Spaniel, ruby, running on beach with a yellow ball in mouth, wearing a lifejacket / life vest.

MYN / Paul Harcourt Davies / Cypress spurge (Euphorbia cyparissa) a common plant with an altitude reange from Mediterranean sea level to high alps, Italy, June. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Cypress spurge (Euphorbia cyparissa) a common plant with an altitude reange from Mediterranean sea level to high alps, Italy, June. meetyourneighbours.net project

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...

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...

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...

Gary K. Smith / Yellow horned poppy (Glaucium flavum) single plant flowering amongst concrete sea defences, Norfolk, UK, September

Eric Baccega / Portrait of tourist guide standing on sea ice, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012

Nick Upton / Thread-winged / Spoonwing lacewing / antlion (Nemoptera sinuata) feeding on pollen and nectar from Oxeye daisy flower (Leucanthemum vulgare) near the coast, with the sea in the background, Lesbos / Le...

Roberto Rinaldi / Yellow fan coral / Seafan (Paramuricea clavata) amongst invasive algae (Caulerpa taxifolia), Strait of Messina, Southern Italy

Roberto Rinaldi / Diver viewing Yellow fan coral / Seafan (Paramuricea clavata) amongst mass of invasive algae (Caulerpa taxifolia), Strait of Messina, Southern Italy

Ernie Janes / Yellow Labrador and Springer spaniel playing in shallow water on beach

Alex Mustard / 2020VISION / Large nudibranch (Tritonia hombergi) with eggs. The eggs are from this species of nudibranch and the adult seems to be feeding on them, which is unusual. The adult may have just laid the eggs and may...

Alex Mustard / 2020VISION / Pair of Nudibranch's (Polycera quadrilineata) mating on a sea matt bryozoan, growing on a kelp frond. Island of Coll, Inner Hebrides. Scotland, UK, June

Alex Mustard / 2020VISION / Norwegian topknot (Phrynorhombus norvegicus) flatfish showing bright colours as it attempts to remain camouflaged on the rusting shipwreck of the MV Pionersk (a Russian fish factory ship). Ness of Tre...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, photographed under normal white light from a flashgun (left) and two examples photographed under blue light, on...

LYNN M. STONE / Yellow Labrador Retriever standing on rocky shelf by sea, Monterey Peninsula, California, USA

Jeff Rotman / Picasso triggerfish (Rhinecanthus assasi) portrait, Red Sea, Egypt

Jeff Rotman / Juvenile Yellow stingray (Urolophus jamaicensis) in open water at night, Bahamas, Caribbean Sea.

Georgette Douwma / Common Sea Horse (Hippocampus hippocampus / taeniopterus). Manado, North Sulawesi, Indonesia.

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Jeff Wilson / The crew of United States Coastguard Cutter 'Healy' prepare decks in the Bering sea, Alaska, USA. The ship served as a platform for the Frozen Planet crew whilst filming Spectacled eider ducks overwin...

Sue Daly / Elegant Anemone (Sagartia elegans venusta). Channel Islands, UK, August.

Juergen Freund / Two whip corals intertwined, Komodo NP, Indonesia.