Alex Mustard / A diver explores Silfra Canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this phot...

Alex Mustard / Grooved brain coral (Diploria labyrinthiformis) at night with polyps extended to feed, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / 2020VISION / Silhouette of Common toad (Bufo bufo) swimming in River Orchy, Highlands, Scotland, UK, April

Alex Mustard / 2020VISION / Basking shark (Cetorhinus maximus) feeding on plankton in the surface waters around the island of Coll, Inner Hebrides, Scotland, UK, June. 2020VISION Book Plate. Did you know? The largest Basking sha...

Alex Mustard / 2020VISION / Grey seal (Halichoerus grypus) swimming amongst kelp, Farne Islands, Northumberland, England, UK, August. 2020VISION Book Plate. Did you know? The 1914 Grey Seal Protection Act ensured this species?su...

Alex Mustard / RF - Portrait of Spinecheek anemonefish (Premnas biaculeatus) in its host Bubble-tip anemone (Entacmaea quadricolor) on a coral reef. Raja Ampat, West Papua, Indonesia. Ceram Sea. (This image may be l...

Alex Mustard / RF - Grey seal (Halichoerus grypus) relaxing in a bed of kelp (Laminaria digitata), with two seals in the background. Farne Islands, Northumberland, England, United Kingdom. British Isles. North Sea....

Alex Mustard / Portrait of a Red Sea anemonefish (Amphiprion bicinctus) above the tentacles of a Magnificent sea anemone (Heteractis magnifica) on a coral reef. Daedelus Reef. Egypt. Red Sea.

Alex Mustard / Portrait of a Bigfin reef squid (Sepioteuthis lessoniana) at night above a coral reef. Gam Island, Raja Ampat, West Papua, Indonesia. Dampier Strait, Tropical West Pacific Ocean.

Stephen Dalton / Orange tip butterfly (Anthocharis cardamines) male in flight amongst Lady's smock or Cuckooflower (Cardamine pratensis),England.

Alex Mustard / Puffins (Fratercula arctica) swimming underwater. Puffins spend most of their lives at sea and are excellent underwater swimmers, which is how they catch small fish, their main food. , Farne Islands,...

Alex Mustard / Leafy seadragon (Phycodurus eques) male carrying eggs, swims over seagrass meadow. Wool Bay, Edithburgh, South Australia. Gulf of St Vincent.

Alex Mustard / Leafy seadragon (Phycodurus eques) demonstrates the effectiveness of its camouflage as it shelters amongst seaweeds. This individual is a male carrying eggs. Wool Bay Jetty, Edithburgh, Yorke Peninsul...

Alex Mustard / School of Oriental sweetlips (Plectorhinchus vittatus) gather tightly together as they rest during the day, with a Clown triggerfish (Balistoides conspicillum) and Midnight snappers (Macolor macularis...

Edwin Giesbers / Orange tip butterfly (Anthocharis cardamines), two females on Cuckooflower (Cardamine pratensis) in marshy grassland, egg visible on stem. April 2009.

Edwin Giesbers / Orange tip butterfly (Anthocharis cardamines) two females on Cuckooflower (Cardamine pratensis). The Netherlands. March.

Alex Mustard / Saddleback anemonefish (Amphiprion polymnus) barks a warning as it guards a clutch of developing eggs (beneath it) laid on a small stone, below a fold in its home, a Haddon's sea anemone (Stichoda...

Alex Mustard / American crocodile (Crocodylus acutus) shows off its teeth. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Alex Mustard / Giant hogfish (Bodianus macrognathos) male yawning at a cleaning station run by juvenile Spanish hogfish (Bodianus rufus). Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea...

Alex Hyde / Orange-tip butterfly (Anthocharis cardamines) egg and newly-emerged caterpillar on seed pod of Garlic Mustard (Alliaria petiolata). Peak District National Park, Derbyshire, UK. May. Focus stacked imag...

Alex Hyde / Orange-tip Butterfly egg (Anthocharis cardamines) on seed pod of Garlic Mustard (Alliaria petiolata). Peak District National Park, Derbyshire, UK. May. Focus stacked image.

Alex Mustard / A shiver of Caribbean reef sharks (Carcharhinus perezi) swim over a coral reef with Common sea fans (Gorgonia ventalina) and sea plumes (Pseudopterogorgia sp). Jardines de la Reina, Gardens of the Que...

Alex Mustard / A vibrant Caribbean coral reef with two Reef sharks (Carcharhinus perezi) and Common sea fans (Gorgonia ventalina) and sea plumes (Pseudopterogorgia sp). Jardines de la Reina, Gardens of the Queen Nat...

Andy Sands / Orange tip butterfly (Anthocaris cardamines) on Cuckoo flower / Lady's smock (Cardamine pratensis), Hertfordshire, England, UK, April - Focus Stacked

Alex Mustard / Split level image of a Southern stingray (Dasyatis americana) swimming over a sand bar. Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Alex Mustard / Long exposure of a group of Tarpon (Megalops atlanticus) hunt Silversides (Atherinidae) inside a coral cavern. George Town, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Light patterns on the seabed and fluffy cumulus clouds in the sky in a split level image. North Sound, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Dugong (Dugong dugon) male, swims over seagrass meadow (Halophila stipulacea) accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Dugong (Dugong dugon) male feeding on a seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Dugong (Dugong dugon) male feeding on a seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) is framed by the surface. Elphinstone reef, Marsa Alam, Egypt. Red Sea.

Alex Mustard / RF - Pod of Spinner dolphins (Stenella longirostris) cruise in formation over the sand of a lagoon while sleeping. Egypt. Red Sea (This image may be licensed either as rights managed or royalty free.)

Alex Mustard / Hard corals (including Acropora sp., Platygyra sp. and Pocillopora spp.) growing in shallow water and reflected in the surface. Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea

Alex Mustard / Reef manta (Mobula alfredi) visiting a cleaning station on a coral reef with a school of Onespot snappers (Lutjanus monostigma), Oriental sweetlips (Plectorhinchus vittatus) and Sabre squirrelfish (Sa...

Alex Mustard / Western clown anemonefish (Amphiprion ocellaris) poses with a large, dominant female behind. The clownfish in the foreground is probably a juvenile. Bitung, North Sulawesi, Indonesia. Lembeh Strait, M...

Guy Edwardes / Field of flowering Poppies (Papaver rhoeas) at sunrise, Val d'Orcia, Tuscany, Italy. May 2019.

Alex Mustard / Southern stingray (Dasyatis americana) two swimming over sand bar, under stormy sky. Grand Cayman, Cayman Islands. British West Indies.

Alex Mustard / Yellow tube sponge (Aplysina fistularis) on coral reef, diver exploring in background. Black Rock Drop Off, East End, Grand Cayman, Cayman Islands, British West Indies. Model released.

Alex Mustard / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) swimming over Seagrass (Halophila stipulacea) meadow. Marsa Nabaa, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) feeding on Seagrass (Halophila stipulacea), blowing sand out of nostrils, on sea floor. Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Spinner dolphin (Stenella longirostris) pod socialising close to surface. Fury Shoal, Sataya Reef, Marsa Alam, Egypt.

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) swimming close to surface. Brothers Islands, Egypt.

Alex Mustard / Jellyfish (Catostylus sp.) swimming in a slick of plastic debris. Turtles feed on jellies such as these and this photo shows how easily they can get confused and feed on plastic instead. Indian Ocean...