Claudio Contreras / Giant Manta Ray (Manta birostris) at cleaning station with Clarion Angelfish (Holacanthus clarionensis) San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific...

Claudio Contreras / Giant Manta Ray (Manta birostris), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico. Vulnerable species.

Franco Banfi / Manta ray (Manta birostris), San Benedicto, Revillagigedo (Socorro) Islands, Mexico, East Pacific Ocean

Franco Banfi / Scuba diver and Manta ray (Manta birostris), San Benedicto, Revillagigedo (Socorro) Islands, Mexico, East Pacific Ocean. Model released.

Juergen Freund / Schooling Chevron barracuda (Sphyraena putnamiae / qenie) Indo-pacific

Doug Perrine / Spinning column of Chevron barracuda {Sphyraena putnamiae} Sipadan, Malaysia

Chris Newbert / Chevron Barracuda (Sphyraena putnamiae) spiraling school, 60 feet deep, Solomon Islands

Michael Pitts / Chevron barracuda fish schooling, Yap, Micronesia

Doug Perrine / Blackfin barracuda (Sphyraena qenie) over seamount, Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) in plan view, deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic...

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic continental c...

Graham Eaton / An anticline in deformed Carboniferous sandstones and shale (Culm Measures) near Bude, Cornwall, UK, March. These rocks were deformed during the Hercynian or Variscan Orogeny, a mountain building even...

Graham Eaton / A Chevron or Kink fold anticline in Carboniferous age turbidite sediments. Bude, Cornwall, UK, may.

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) in plan view, deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic...

Graham Eaton / Chevron recumbent folding in Carboniferous age sandstone and shale (Culm Measures), deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late...

Graham Eaton / Chevron folded Carboniferous age sandstone and shale (Culm Measures), deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic cont...

Graham Eaton / Chevron recumbent folding in Carboniferous age sandstone and shale (Culm Measures), deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late...

Bert Willaert / Sea fan, soft corals and feather stars with Blackfin barracuda (Sphyraena qenie) swimming above. Kimbe Bay, West New Britain, Papua New Guinea

Bert Willaert / School of Blackfin barracuda (Sphyraena qenie), Kimbe Bay, West New Britain, Papua New Guinea

Bert Willaert / School of Blackfin barracuda (Sphyraena qenie), Kimbe Bay, West New Britain, Papua New Guinea

Alex Mustard / School of Blackfin barracuda (Sphyraena qenie) in open water off the wall with diver. Yolanda Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Franco Banfi / Shoal of Blackfin barracuda (Sphyraena qenie) South Point dive site, Sanganeb reef, Sudan, Red Sea

Franco Banfi / Shoal of Blackfin barracuda (Sphyraena qenie) South Point dive site, Sanganeb reef, Sudan, Red Sea

Graham Eaton / The Ladies Cave anticline, an asymmetric chevron fold formed during the Variscan orogeny, in Carboniferous, Westphalian, Lower Coal Measures, sediments. Saundersfoot, Pembrokeshire, Wales. June 2017

Graham Eaton / The Ladies Cave anticline, an asymmetric chevron fold formed during the Variscan orogeny, in Carboniferous, Westphalian, Lower Coal Measures, sediments. Saundersfoot, Pembrokeshire, Wales. June 2017

Graham Eaton / The Ladies Cave anticline, an asymmetric chevron fold formed during the Variscan orogeny, in Carboniferous, Westphalian, Lower Coal Measures, sediments. Saundersfoot, Pembrokeshire, Wales. June 2017

Franco Banfi / Candy-striped shrimp (Lebbeus grandimanus) on Crimson anemone (Cribrinopsis fernaldi), Alaska, United States, North Pacific Ocean.

Franco Banfi / Candy-striped shrimp (Lebbeus grandimanus) on Crimson anemone (Cribrinopsis fernaldi), Alaska, United States, North Pacific Ocean.

Nick Upton / Chevron folds of sandstone and shale rock layers in Millook Haven cliffs, Cornwall, UK, April 2014.

Nick Upton / Chevron folds of sandstone and shale rock layers in Millook Haven cliffs, Cornwall, UK, April 2014.

Nick Upton / Close up of sandstone and shale rock layers in Chevron folds, Millook Haven cliffs, Cornwall, UK, April 2014.

Nick Upton / Chevron folds of Sandstone and shale rock layers in Millook Haven cliffs, Cornwall, UK, April 2014.

Nick Upton / Chevron folds of Sandstone, mudstone and black shale rock layers in Millook Haven cliffs, Cornwall, UK, April 2014.

Nick Upton / Chevron folds of Sandstone and shale rock layers in Millook Haven cliffs, Cornwall, UK, April 2014.

Tony Wu / Blackfin barracuda (Sphyraena qenie) school, Black and Silver dive site near Nuakata Island in Milne Bay, Papua New Guinea

Tony Wu / Eric Cheng photographing a large school of Chevron barracuda (Sphyraena qenie) Point P dive stie, Eastern Fields of Papua New Guinea.

Georgette Douwma / Blue chevron butterflyfish (Chaetodon larvatus). Egypt, Red Sea.

Georgette Douwma / Red Sea Eritrean butterflyfish(Chaetodon paucifasciatus). Egypt, Red Sea.

Juergen Freund / Giant manta rays (Manta birostris) at a cleaning station with cleaner wrasses. North Raja Ampat, West Papua, Indonesia

Juergen Freund / Giant manta rays (Manta birostris) at a cleaning station with cleaner wrasses. North Raja Ampat, West Papua, Indonesia

Jeff Rotman / Manta ray (Manta birostris) caught in gill net, Huatabampo, Mexico, Sea of Cortez, Pacific Ocean. Vulnerable species.

Jeff Rotman / Diver with Manta ray (Manta birostris) caught in gill net, Huatabampo, Mexico, Sea of Cortez, Pacific Ocean. Vulnerable species. Model released.

Jeff Rotman / Diver with Manta ray (Manta birostris) caught in gill net, Huatabampo, Mexico, Sea of Cortez, Pacific Ocean. Vulnerable species. Model released.

Pete Oxford / Chevroned butterflyfish (Chaetodon trifascialis) Rainbow Reef, Fiji, South Pacific.

Jeff Rotman / Manta ray (Manta birostris) caught in gill net, Huatampo, Mexico, Gulf of California, Pacific Ocean. Vulnerable species.

Pascal Kobeh / Manta ray (Manta birostris) at night, mouth wide open feeding on plankton which is attracted by the light at the end of a jetty, Maldives. Indian ocean.

Pascal Kobeh / Manta ray (Manta birostris) at night, mouth wide open feeding on plankton which is attracted by the light at the end of a jetty, Maldives. Indian ocean.

Pascal Kobeh / School of Blackfin barracudas (Sphyraena qenie) with Black surgeonfish (Acanthurus gahhm) Sudan. Red Sea.

Pascal Kobeh / Blackfin barracudas (Sphyraena qenie) in open water cleaned by a Bluestreak cleaner wrasse (Labroides dimidiatus) Sudan. Red Sea.

Pascal Kobeh / Giant manta ray (manta birostris) with two Remoras (Remora remora) attached its body and surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) Re...

Pascal Kobeh / Giant manta ray (manta birostris) with two Remoras (Remora remora) attached its body and surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) Re...

Pascal Kobeh / Diver filming a Giant manta ray (manta birostris) with two Remoras (Remora remora) attached its body and surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus c...

Pascal Kobeh / Divers behind a Giant manta ray (manta birostris) with two Remoras (Remora remora) attached its body and surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus c...

Pascal Kobeh / Diver filming a giant manta ray (manta birostris) swimming in open water with two remoras (Remora remora) hung on its body and surrounded with black jacks / trevally (Caranx lugubris), Revillagigedo i...

Pascal Kobeh / Giant manta ray (manta birostris) swimming in open water surrounded with black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) which usually cleans it, Revillagig...

Pascal Kobeh / Giant manta ray (manta birostris) swimming in open water surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) Revillagigedo islands, Mexico. Paci...

Pascal Kobeh / Giant manta ray (manta birostris) swimming in open water surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) Revillagigedo islands, Mexico. Paci...

Pascal Kobeh / Giant manta ray (manta birostris) swimming in open water surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) Revillagigedo islands, Mexico. Paci...

Pascal Kobeh / Giant manta ray (manta birostris) swimming in open water surrounded with Black jacks / trevally (Caranx lugubris) and a Clarion angelfish (Holacanthus clarionensis) Revillagigedo islands, Mexico. Paci...

Jeff Rotman / Manta Ray (Manta birostris) caught in gill net, Huatampo, Mexico. Gulf of California, Sea of Cortez, Pacific Ocean

Pascal Kobeh / School of Blackfin barracudas (Sphyraena qenie) Sudan. Red Sea.

Pascal Kobeh / School of Blackfin barracudas (Sphyraena qenie) Sudan. Red Sea.

Pascal Kobeh / School of Blue trevally / jacks (Carangoides ferdau) following a Blackfin barracuda (Sphyraena qenie) Palau. Philippine 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 / School of Blackfin barracuda (Sphyraena qenie) in open water off the wall at Shark Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Alex Mustard / School of Blackfin barracuda (Sphyraena qenie) in open water off the wall at Shark Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Alex Mustard / Portrait of an Orangeface butterflyfish (Chaetodon larvatus) This species is endemic to the Red Sea. Wreck of Kingston, Shag Rock, Sinai, Egypt. Gulf of Suez, Red Sea.

Claudio Contreras / Giant Manta Ray (Manta birostris) with remoras attached, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico. Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris) and diver, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico, April. Vulnerable.

Claudio Contreras / Giant Manta Ray (Manta birostris) with Remoras (Remora sp) attached, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico. Vulnerable...

Claudio Contreras / Giant Manta Ray (Manta birostris) and diver, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico. Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris) and photographer, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico. Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris) with Remora (Remora sp) and diver, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico. Vulnerable spec...

Claudio Contreras / Giant Manta Ray (Manta birostris), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve, The Socorro Islands, Pacific Ocean, western Mexico, Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico, Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico, April. Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris) with remora (Remora sp) Socorro Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific Ocean, western Mexico, April. Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris) feeding, near Isla Mujeres, Caribbean Sea, Mexico, July. Vulnerable species.

Claudio Contreras / Giant Manta Ray (Manta birostris) and Whale Shark (Rhincodon typus) feeding, near Isla Mujeres, Caribbean Sea, Mexico, July. Both vulnerable species.

Solvin Zankl / Giant manta rays (Manta birostris) at cleaning station North Raja Ampat, West Papua, Indonesia, Pacific Ocean

Solvin Zankl / Giant manta rays (Manta birostris) North Raja Ampat, West Papua, Indonesia, Pacific Ocean

Alex Mustard / School of Blackfin barracuda (Sphyraena qenie) forming circle in open water off the wall at Shark Reef, Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Solvin Zankl / Two Giant manta rays (Manta birostris) feeding on plankton, North Raja Ampat, West Papua, Indonesia, Pacific Ocean, Vulnerable species.

Georgette Douwma / Eritrean / Crown butterflyfish (Chaetodon paucifasciatus) Egypt, Red Sea. Red Sea and Gulf of Aden.

Robin Chittenden / Trinidad Chevron Tarantula (Psalmopoeus cambridgei) on bamboo, Trinidad, Trinidad and Tobago, April

Robin Chittenden / Trinidad Chevron Tarantula (Psalmopoeus cambridgei) on bamboo, Trinidad, Trinidad and Tobago, April

Juergen Freund / Schooling Chevron barracudas (Sphyraena putnamiae) Sipadan, Malaysia.

Juergen Freund / Schooling Chevron barracudas (Sphyraena putnamiae) Sipadan, Malaysia.

Juergen Freund / Schooling Chevron barracudas (Sphyraena putnamiae) Sipadan, Malaysia.

Robert Thompson / Chevron moth (Eulithis testata) on Bell heather flowers, Ballykinler Dunes, County Down, Northern Ireland, UK, September

Robert Thompson / Chevron moth (Eulithis testata) on Bell heather flowers, Ballykinler Dunes, County Down, Northern Ireland, UK, September

SINCLAIR STAMMERS / Synclinal chevron fold in Silurian mudstones, on the grassy plateau beyond can be seen the remains of an Iron Age fort 'Castell Bach', Cerediogion, West Wales, UK

Fred Bavendam / Chevron Butterflyfish (Chaetodon trifascialis) showing nocturnal coloration, Bali, Indonesia

Fred Bavendam / Chevron Butterflyfish (Chaetodon trifascialis), Bali, Indonesia