Juergen Freund / Whitemargin stargazer (Uranoscopus sulphureus) half hidden in the sand. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Schooling Banggai cardinalfish (Pterapogon kauderni). Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Face of a Common lionfish (Pterios volitans) on top of the reef. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Wonderpus (Wonderpus photogenicus) swimming well above the sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Nudibranchs (Hypselodoris / Chromodoris bullocki) mating and laying eggs, Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Poison ocellate octopus (Octopus mototi) on seabed. Lembeh Strait, North Sulawesi, Indonesia

Alex Mustard / A Pygmy Seahorse (Hippocampus bargibanti) in red seafan (Muricella sp.). Pygmy Seahorses are small, most less than 15mm in total length. Tulamben, Bali, Indonesia, Java Sea, August.

Alex Mustard / A Pygmy Seahorse (Hippocampus bargibanti) camouflaged in red Seafan (Muricella sp.). Pygmy Seahorses are small, most less than 15mm in length. Tulamben, Bali, Indonesia, October.

Juergen Freund / Green sea turtle (Chelonia mydas) resting in a crevice in the coral reef. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Mating Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of Green turtle (Chelonia mydas) in the reef shallows, swimming towards the camera. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) seen from above, swimming away from the camera. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Yellow Shortfin lionfish (Dendrochirus brachypterus) face. Lembeh Strait, Sulawesi, Indonesia

Juergen Freund / Green turtle (Chelonia mydas) portrait. Sipadan Island, Semporna, Sabah, Malaysia

Juergen Freund / Four Green turtles (Chelonia mydas) looking for resting places on the reef. Sipadan Island, Semporna, Sabah, Malaysia, June

Roland Seitre / Leopard cat (Prionailurus bengalensis) captive occurs in South East Asia.

Alex Mustard / Female Tassled wobbegong shark (Eucrossorhinus dasypogon) rests alongside stand of Barrel sponges (Xestospongia testudinaria) Blue Magic, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean...

Alex Mustard / Slender sapsucking slug (Thuridilla gracilis) on surface of Royal seasquirt (Polycarpa aurata) Aljui Bay, Waigeo Island, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean.

Alex Mustard / Large male Hawksbill turtle (Eretmochelys imbricata) swimming in open water. Tank Rock, Fiabacet, Misool, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean. Ceram Sea.

Alex Mustard / Large male Hawksbill turtle (Eretmochelys imbricata) swimming in open water. Tank Rock, Fiabacet, Misool, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean. Ceram Sea.

Alex Mustard / School of Blackfin barracuda (Sphyraena qenie) are framed against Snell's Window. Waigeo, Raja Ampat, West Papua Indonesia. Dampier Strait, Tropical West Pacific Ocean.

Alex Mustard / Thriving reef scene, with Seafans (Melithaea sp.) and reef fish. Boo West, Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea.

Alex Mustard / Pink anemonefish (Amphiprion perideraion) in Purple magnificent sea anemone (Heteractis magnifica) Misool, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean.

Alex Mustard / Clown triggerfish (Balistoides conspicillum) between pair of Seafans (Melithaea sp.) Fiabacet Islands, Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea.

Alex Mustard / Devil scorpionfish (Inimicus didactylus) moves across sandy seabed. Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Alex Mustard / Group of Saddleback anemonefish (Amphiprion polymnus) guard clutch of eggs, laid on stone near the base of anemone. Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Alex Mustard / Pair of male Longtail dragonets (Callionymus neptunius) aggressively displaying to each other, Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Alex Mustard / Dancing shrimps (Rhynchocinetes durbanensis) on an orange sponge. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / Portrait of Saddleback anemonefish (Amphiprion polymnus) Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / Pair of Pink anemonefish (Amphiprion perideraion) within their host Magnificent sea anemone (Heteractis magnifica) Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Oc...

Alex Mustard / Geographic sea hare (Syphonota geographica) swimming using its parapodial lobes as flapping wings. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / Amphipod (Amphipoda) living inside sea squirt (Rhopalaea sp.) Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / High magnification portrait of Tiny hairy shrimp (Phycocaris simulans) with eggs, backlit. Secret Bay, Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / Warty frogfish (Antennarius maculatus) swimming over the seabed, by gulping in water, then closing its mouth and squirting the water out of vents by its pelvic fins. Anilao, Batangas, Luzon, Philippin...

Alex Mustard / Many host goby (Pleurosicya mossambica) on leather coral. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Pair of Giant frogfish (Antennarius commersoni), male on the left, female above on right on sponges. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Golf-ball sized Painted frogfish (Antennarius pictus) yawning warning as it waits to ambush prey disguised as an orange sponge. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Pair of Tiger shrimps (Phyllognathia ceratophthalmus) on top of piece of coral. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Hairy frogfish (Antennarius striatus) attempting to attract prey with its worm shaped lure. Aer Prang, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Hairy frogfish (Antennarius striatus) lying in wait for prey on the sand. This large individual was probably female. Aer Prang, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Se...

Alex Mustard / Portrait of Hairy frogfish (Antennarius striatus) lying in wait for prey on the sand. This large individual was probably female. Aer Prang, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Se...

Alex Mustard / Hairy frogfish (Antennarius striatus) using its worm shaped lure to attract prey. Aer Prang, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Papuan toby (Canthigaster papua) Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Weedy scorpionfish (Rhinopias frondosa) moving across the seabed. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Backlit portrait of Paddle-flap scorpionfish (Rhinopias eschmeyeri) on rubble slope. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Hairy frogfish (Antennarius striatus) lying in wait for prey on the sand. This large individual was probably female. Aer Prang, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Se...

Alex Mustard / Golf-ball sized Painted frogfish (Antennarius pictus) waits to ambush prey disguised as an orange sponge. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Paddle-flap scorpionfish (Rhinopias eschmeyeri) on rubble slope. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Pair of Painted frogfish (Antennarius pictus) the smaller male is guarding the female prior to mating. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Painted stingfish (Minous pictus) crawling over the sand on modified pectoral fins at night. Bitung, North Sulawesi, Indonesia, South East Asia. Lembeh Strait, Molucca Sea.

Alex Mustard / Weedy scorpionfish (Rhinopias frondosa) on coral rubble slope. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / False clown anemonefish (Amphiprion ocellaris) in front of an ameone (out of focus) Tulamben Bay, Bali, Indonesia. Java Sea.

Alex Mustard / Candy crab (Hoplophrys oatesii) on Dendronephthya soft coral bush. Tulamben Bay, Bali, Indonesia. Java Sea.

Alex Mustard / Tiny (7mm) herbivorous sap-sucking seaslug (Costasiella kuroshimae) crawling over piece of algae next to its circular egg ribbon. Seraya, Bali, Indonesia. Java Sea

Alex Mustard / Backlit leaf scorpionfish (Taenianotus triacanthus) yawning. Probably warning. Amed, Bali, Indonesia. Java Sea.

Alex Mustard / Pair of Sponge porcelain crabs (Aliaporcellana sp.) shelter in groove of large Barrel sponge (Xestospongia testudinaria) Seraya, Bali, Indonesia. Java Sea.

Alex Mustard / Weedy scorpionfish (Rhinopias frondosa) on coral rubble slope. Sedum, Bali, Indonesia. Java Sea.

Alex Mustard / Detail of pattern of an adult Emperor angelfish (Pomacanthus imperator) Seraya, Tulamben, Bali, Indonesia. Java Sea.

Alex Mustard / Reef stonefish (Synanceia verrucosa) hiding amongst rocks in shallow water. Seraya, Bali, Indonesia. Java Sea.

Alex Mustard / Flamboyant cuttlefish (Metasepia pfefferi) moving across the sand at night. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Pygmy seahorse (Hippocampus bargibanti) sheltering in seafan (Muricella sp.), which is backlit by flash. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Veined octopus (Amphioctopus marginatus) scuttles across the seabed. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Tiny (10mm) pygmy seahorse (Hippocampus denise) sheltering in seafan. This is an unusual colour type of denise pygmy seahorse and is probably male. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Mo...

Alex Mustard / Veined octopus (Amphioctopus marginatus) comes out from its den, lifting up piece of shell. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Young Green sea turtle ( Chelonia mydas) resting in leather corals (Sarcophyton sp) Apo Island, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Alex Mustard / Veined octopus (Amphioctopus marginatus) sheltering in an empty cockle shell. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Alex Mustard / Blue ringed octopus (Hapalochlaena lunulata) displaying as it moves across the seabed. Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Alex Mustard / Blue ringed octopus (Hapalochlaena lunulata) displays as it moves across the seabed. Dauin, Dumaguete, Negros, Philippines. Bohol Sea, Tropical West Pacific Ocean.

Roland Seitre / Grey pelican (Pelecanus philippensis) calling, Thailand.

Roland Seitre / Grey pelican (Pelecanus philippensis) chick at nest, Thailand.

Roland Seitre / Grey pelican (Pelecanus philippensis) nesting colony, Thailand.

Roland Seitre / Grey pelican (Pelecanus philippensis) Thailand.

Roland Seitre / Grey pelican (Pelecanus philippensis) chick at nest, Thailand.

Roland Seitre / Grey pelican (Pelecanus philippensis) on nest, Thailand.

Roland Seitre / Grey pelicans (Pelecanus philippensis) Thailand.

Roland Seitre / Grey pelican (Pelecanus philippensis) swimming, Thailand.

Mateusz Piesiak / Bramblings (Fringilla montifringilla) flock in flight, Lower Silesia, Poland. February.

Mateusz Piesiak / Brambling (Fringilla montifringilla) perched on Sunflower (Helianthus annuus) seedhead, Lower Silesia, Poland. February.

Mateusz Piesiak / Bramblings (Fringilla montifringilla) flock in flight over field of Sunflowers (Helianthus annuus), Lower Silesia, Poland. February.

Mateusz Piesiak / Brambling (Fringilla montifringilla) perched on Sunflower (Helianthus annuus) seedhead in falling snow, Lower Silesia, Poland. February.

Mateusz Piesiak / Eurasian sparrowhawk (Accipiter nisus) hunting flock of Bramblings (Fringilla montifringilla) in falling snow, Lower Silesia, Poland. February.

Mateusz Piesiak / Bramblings (Fringilla montifringilla) and European goldfinch (Carduelis carduelis) flock in flight over field of Sunflowers (Helianthus annuus) in falling snow, Lower Silesia, Poland. February.

Mateusz Piesiak / Bramblings (Fringilla montifringilla) flock in flight over field of Sunflowers (Helianthus annuus) in falling snow, Lower Silesia, Poland. February.

Mateusz Piesiak / Brambling (Fringilla montifringilla) perched on Sunflower (Helianthus annuus) seedhead in falling snow, Lower Silesia, Poland. February.