Neil Challis / Mudskipper (Periophthalmus) displaying with pectoral fin at the entrance to its hole, Southern Thailand, March.
Joel Sartore / Photo Ark / Chinese blind cave fish (Sinocyclocheilus furcordorsalis) swimming in the darkness, then out of frame, Berlin Aquarium. Captive.
Noemie Stroh / Orbicular batfish (Platax orbicularis) schooling into the blue, Shark Reef, Ras Mohamed National park, Red Sea, Egypt, June.
Noemie Stroh / Napoleon wrasse (Cheilinus undulatus) female swimming through soft coral garden, Daedalus, Red Sea, Egypt, August.
Magnus Lundgren / Juvenile Ocellaris / Common clownfish (Amphiprion ocellaris) looking out from its home in an anemone, Raja Ampat, West Papua, Indonesia, Pacific Ocean.
Magnus Lundgren / School of Yellow-ribbon sweetlips (Plectorhinchus polytaenia) swimming with the current, Raja Ampat, Indonesia, Pacific Ocean.
Lewis Jefferies / Female Scalefin anthias (Pseudanthias squamipinnis) and trigger fish feeding in vibrant coral reef scene, Maldives, Indian Ocean
Lewis Jefferies / Powder blue tangs (Acanthurus leucosternon) shoaling, Maldives, Indian Ocean.
Lewis Jefferies / Blackfinned anemonefish (Amphiprion nigripes) family seeks shelter in safety of Anemone's stinging tentacles, South Ari Atoll, Maldives, Indian Ocean.
Henley Spiers / Striped marlin (Kajikia audax) striking a shoal of baitfish during the largest known seasonal aggregation of Marlin, Magdalena Bay, Baja California Sur, Mexico, Pacific Ocean. November 2019
Henley Spiers / Striped marlin (Kajikia audax) and California sea lion (Zalophus californianus) competing for food as they hunt down baitfish, Magdalena Bay, Baja California Sur, Mexico, Pacific Ocean.
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 / 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.
David Fleetham / Endangered Green sea turtle (Chelonia mydas) stretches neck to be cleaned by Yellow tangs (Zebrasoma flavescens) and Goldring tangs (Ctenochaetus strigosus), North Pacific, Hawaii, USA.
Pascal Kobeh / A school of Bluespotted cornetfish (Fistularia commersonii), Red Sea, Egypt.
Doug Perrine / Blue marlin (Makaira nigricans) Vava'u, Kingdom of Tonga, South Pacific
Milan Radisics / Female Red fox (Vulpes vulpes) walking along tree trunk in heavy fog at night. Light source behind the subject creates dramatic volumetric lighting. Vertes Mountains, Hungary.
Guy Edwardes / Evening sunlight illuminating Wasdale Head and Wast Water from Great Gable, Lake District National Park, Cumbria, England, UK. December 2020
Solvin Zankl / Bioluminescent anglerfish (Cryptopsaras couesi), deep sea fish from, Atlantic Ocean off Cape Verde. Captive.
Solvin Zankl / Scaleless black dragonfish (Melanostomias biseriatus) appearing out of the darkness and swimming towards the camera, Atlantic Ocean close to Cape Verde.
Solvin Zankl / Portrait of Scaleless black dragonfish (Melanostomias biseriatus), Atlantic Ocean close to Cape Verde.
Solvin Zankl / Giant manta ray (Manta birostris) at cleaning station North Raja Ampat, West Papua, Indonesia, Pacific Ocean.
Simon Littlejohn / Grey heron (Ardea cinerea) standing on rivers edge in heavy rain, swallowing a small Pike (Esox lucius),River Stour, Dorset, UK, September.
Franco Banfi / Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Vulnerable. Santa Maria Island, Azores, Portugal, Atlantic Ocean
Guy Edwardes / Bonnet mycena fungus (Mycena galericulata) on deadwood in ancient broadleaved woodland, sun shining through trees. New Forest National Park, England, UK. October.
Andy Murch / Red stingray (Hemitrygon akajei) with Banded houndshark (Triakis scyllium) group and smaller fish in background. Chiba Prefecture, Honshu, Japan. September.
Andy Murch / Rasptail skate (Raja velezi) resting on sea floor. La Paz Bay, Baja California Sur, Mexico.
Shane Gross / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) shoal swimming over Turtlegrass (Halophila stipulacea) seagrass bed. Marsa Alam, Egypt.
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...
Guy Edwardes / Dalmatian Pelican (Pelecanus crispus) landing on Lake Kerkini, Greece
Tony Wu / Crab-eye goby (Signigobius biocellatus), mimics crab with eye-spot markings on dorsal fins and back and forth movement. Loloata Island, Papua New Guinea.
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 / 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...
Philippe Clement / Female Common kingfisher (Alcedo atthis) diving and catching a Nine-spined stickleback (Pungitius pungitius) fish, stuns and eats it, Belgium, June.
Mark Carwardine / Spinetail devil ray (Mobula mobular), four with rays of light and sparkle of sun on water, aerial view. Sea of Cortez, Baja California, Mexico. March.
Tony Wu / Male Korean seahorse (Hippocampus haema) giving birth. Kumamoto Prefecture, Kyushu, Japan.
Tui De Roy / Three White rhinoceroses (Ceratotherium simum), Solio Game Reserve, Laikipia, Kenya. September.
Brandon Cole / Crescent-tail bigeyes (Priacanthus hamrur), and Grey reef sharks (Carcharhinus amblyrhynchos). French Polynesia, Pacific Ocean.
Brandon Cole / Crocodile fish (Cymbacephalus beauforti) camouflaged, Egypt, Red Sea.