Tony Wu / Fringed blenny (Chirolophis japonicus) guarding its eggs. Miyagi Prefecture, Japan.

Juergen Freund / Blue-lined fangblenny (Plagiotremus rhinorhynchos) hiding in a plastic container, they usually hide in deserted worm tubes or other small holes, North Sulawesi, Indonesia.

David Fleetham / Spinyhead blenny (Acanthemblemaria spinosa) in hard coral, Netherlands Antilles, Bonaire, Caribbean.

David Fleetham / Spinyhead blenny (Acanthemblemaria spinosa) in hard coral, Netherlands Antilles, Bonaire, Caribbean.

Alex Mustard / Tompot blenny (Parablennius gattorugine) portrait, Swanage Pier, Swanage, Dorset, UK, English Channel, August

Alex Mustard,Alex Mustard / A signal blenny (Emblemaria hypacanthus) displays its showy dorsal fin as it extends out of its tube home. La Paz, Mexico. Sea Of Cortez, East Pacific Ocean.

Linda Pitkin / 2020VISION / Tompot blenny (Parablennius gattorugine), Swanage, Dorset, England, UK, May

Linda Pitkin / 2020VISION / Male Black faced blenny (Tripterygion delaisi), part of a sequence showing colour change, Swanage, Dorset, England, UK, May. 2/4

Alex Mustard / 2020VISION / Tompot blenny (Parablennius gattorugine) beneath Swanage Pier, Dorset, UK. Photographed during May. English Channel.

Alex Mustard / Secretary blenny (Acanthemblemaria maria) making a home in a deserved worm tube of a great star coral (Montastraea cavernosa), East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Se...

Alex Mustard / 2020VISION / Portrait of Tompot blenny (Parablennius gattorugine) male in bright breeding colours, Swanage Pier, Dorset, UK, July

Alex Mustard / 2020VISION / Tompot blenny (Parablennius gattorugine) in bright summer mating colours, peering out from his home in a discarded tube, where he was guarding his eggs (not visible in this photo), Swanage Pier, Dorse...

Juergen Freund / Elephant ear sponge (Ianthella basta) with a Triplefin blenny resting on it, West New Britain, Papua New Guinea.

Juergen Freund / Convict blennies / False catfish, juvenile, (Pholidichthys leucotaenia) amidst a fan coral. Misool, Raja Ampat, West Papua, Indonesia,

Wild Wonders of Europe / Banfi / Striped blenny (Parablennius rouxi) looking out of an encrusting sponge covered hole, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Wild Wonders of Europe / Banfi / Striped blenny (Parablennius rouxi) looking out of hole in rock covered with encrusting sponge, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Wild Wonders of Europe / Banfi / Male Yellow triplefin blenny (Tripterygion delaisi) Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Wild Wonders of Europe / Banfi / Striped blenny (Parablennius rouxi) looking out of a hole in a rock covered with encrusting sponge, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Wild Wonders of Europe / Banfi / Ringneck blenny (Parablennius pilicornis) Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Doug Perrine / Wrasse blenny {Hemiemblemaria simulus} in giant brain coral, Bahamas, mimics cleaning wrasse

Chris Newbert / Freckle Face Blenny (Istiblennius chrysospilos) in burrow, five feet deep, Solomon Islands

Alex Mustard / Convict blennies (Pholidichthys leucotaenia) swim across a coral reef with seafan (Melithaea sp.) behind. Misool, Raja Ampat, West Papua, Indonesia. Misool Marine Protected Area. Ceram Sea. Tropical W...

Tony Wu / Striped poison-fang blenny mimic (Petroscirtes breviceps) male inside bivalve shell, guarding eggs laid by different females adhered to inside of shell. Shizuoka Prefecture, Honshu, Japan. June.

Magnus Lundgren / Wild Wonders of China / Striped poison-fang blenny (Meiacanthus grammistes) Xiaoliuqiu Island, Taiwan. Venomous species.

Shane Gross / Arrow blenny (Lucayablennius zingaro) peeking out from Fire coral (Millepora dichotoma). Gardens of the Queen National Park, Cuba.

Magnus Lundgren / Wild Wonders of China / Striped poison-fang blend (Meiacanthus grammistes) Xiaoliuqiu Island, Taiwan

Pascal Kobeh / Blue-striped blenny (Plagiotremus rhinorhynchos) hiding in a sponge, Sulu sea, Philippines

Alex Mustard / Splendid starksia blenny (Starksia splendens) peers out from a hole in a coral reef. This species in endemic to the Cayman Islands and was first described in 2018. East End, Grand Cayman, Cayman Islan...

Georgette Douwma / Striped poison fang blenny (Meiacanthus grammistes) in a bottle. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Striped poison-fang blenny (Meiacanthus grammistes) swimming out of discarded bottle home, surrounded by rubbish, Sulawesi, Indonesia. November.

Juergen Freund / Striped poison-fang blenny (Meiacanthus grammistes) using a discarded oil container as its home, Sulawesi, Indonesia. November.

Juergen Freund / Striped poison-fang blenny (Meiacanthus grammistes) in its discarded bottle home, surrounded by rubbish, Sulawesi, Indonesia. November.

Juergen Freund / Striped poison-fang blenny (Meiacanthus grammistes) swimming above its discarded bottle home, surrounded by rubbish, Sulawesi, Indonesia. November.

Georgette Douwma / Barred blenny (Cirripectes polyzona). West Papua, Indonesia. Indo-West Pacific.

Georgette Douwma / Barred blenny (Cirripectes polyzona). West Papua, Indonesia. Indo-Pacific.

Georgette Douwma / Tailspot Blenny (Ecsenius stigmatura). West Papua, Indonesia. Indo-West Pacific.

Georgette Douwma / Tailspot blenny (Ecsenius stigmatura). West Papua, Indonesia. Indo-West Pacific.

Gary Bell/ Oceanwide / Hairtail Blenny (Xiphasia setifer), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Blue-striped Blenny (Plagiotremus rhinorhynchos) in brain coral, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Blue-striped Blenny (Plagiotremus rhinorhynchos), Great Barrier Reef, Australia

Alex Mustard / Galapagos barnacle blenny (Acanthemblemaria castroi) looking out from its home in an old barnacle shell. Cape Marshall, Isabela Island, Galapagos National Park, Galapagos Islands. East Pacific Ocean....

Alex Mustard / A wide angle view of a male Tompot blenny (Parablennius gattorugine) peering out of its den, in a leg of Swanage Pier. Swanage, Dorset, England, United Kingdom. English Channel. North East Atlantic Oc...

Magnus Lundgren / Wild Wonders of China / Crown spotty blenny (Laiphognathus longispinis) Pak Lap Tsai, Sai Kung East Country Park, Hong Kong, China.

Magnus Lundgren / Wild Wonders of China / Combtooth blenny (Omobranchus elegans) in Bohai Sea, Yellow Sea. Zhifu Island, Shandong Province, China.

Magnus Lundgren / Wild Wonders of China / Combtooth blenny (Omobranchus elegans) in Bohai Sea, Yellow Sea. Zhifu Island, Shandong Province, China.

Tony Wu / Long shanny / Northern blenny (Stichaeus grigorjewi) extending multi-pronged lure to attract prey at night. Sea of Japan, Japan. March.

Tony Wu / Long shanny / Northern blenny (Stichaeus grigorjewi) extending multi-pronged lure to attract prey at night. Toyama Prefecture, Honshu, Japan. March.

Richard Robinson / Fourmanoir's Blenny (Ecsenius fourmanoiri) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Richard Robinson / Fourmanoir's blenny (Ecsenius fourmanoiri) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Richard Robinson / Fourmanoir's blenny (Ecsenius fourmanoiri) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Richard Robinson / Fourmanoir's blenny (Ecsenius fourmanoiri) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

David Fleetham / Seaweed blenny (Parablennius marmoreus) peeping out from crevice. Florida, USA.

Richard Robinson / Fiji Blenny (Ecsenius fijiensis) at Namuka-i-Lau Island lagoon, Lau Island Group, Fiji. Endemic species.

Richard Robinson / Fiji Blenny (Ecsenius fijiensis) at Yagasa Lagoon, Lau Island Group, Fiji. Endemic species.

Richard Robinson / Fiji blenny (Ecsenius fijiensis) at Yagasa Lagoon, Lau Island Group, Fiji. Endemic species.

Richard Robinson / Helen's triplefin (Ceratobregma helenae) at Vautoa Ono, Lau Island Group, Fiji.

Linda Pitkin / Spinyhead blenny (Acanthemblemaria spinosa), in a hole in coral Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Spinyhead blenny (Acanthemblemaria spinosa), in a hole in coral Bonaire, Leeward Antilles, Caribbean.

Claudio Contreras / Panamic fanged blenny (Ophioblennius steindachneri), San Agustin Bay, Huatulco Bays National Park, southern Mexico, November

Alex Mustard / Rhinoceros triplefin (Helcogramma rhinoceros) male displaying his dark mating colours and lifts his extended snout to impress a more drably coloured female as she lays eggs in their nest. Seraya, Tula...

Alex Mustard / Portrait of a striped triplefin (Helcogramma striatum) sitting on top of a coral. Menjangan Island, Bali, Indonesia. Java Sea

Alex Mustard / Spinyhead blenny (Acanthemblemaria spinosa) yawning as its emerges from its hole in a red sponge on a coral reef. This fish was previously identified as the secretary blenny in many sources. Jardines...

Claudio Contreras / Garibaldi (Hypsypops rubicundus) and Giant kelpfish (Heterostichus rostratus) among Southern sea palm (Eisenia arborea), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja Ca...

Claudio Contreras / Giant kelpfish (Heterostichus rostratus), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Claudio Contreras / Giant kelpfish (Heterostichus rostratus), San Benitos Islands, Baja California Pacific Islands Biosphere Reserve, Baja California, Mexico, May

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Browncheek blenny (Acanthemblemaria crockeri), Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Angel de la Guarda Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Salsipuedes Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Claudio Contreras / Lizard triplefin (Crocodilichthys gracilis), Salsipuedes Island Protected Area, Gulf of California (Sea of Cortez), Mexico, July

Georgette Douwma / Convict blenny or False catfish (Pholidichthys leucotaenia). juveniles school in vast numbers over coral reefs. Ambon, Indonesia.

Franco Banfi / Lance blenny (Aspidontus dussumieri) looking out of hole, Cabilao House Reef, Capilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Bert Willaert / Yaeyama blenny (Ecsenius yaeyamaensis), Kimbe Bay, West New Britain, Papua New Guinea

Bert Willaert / Segmented Blenny (Salarias segmentatus), Kimbe Bay, West New Britain, Papua New Guinea

Robert Thompson / Common blenny (Lipophrys pholis) Ballywhoriskey point, Fanad peninsula, County Donegal, Republic of Ireland.

Robert Thompson / Blenny (Lipophrys pholis) Ballywhoriskey Point, Fanad Peninsula, County Donegal, Northern Ireland.

Alex Mustard / Spinyhead blenny (Acanthemblemaria spinosa) yawning, on a red sponge. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Alex Mustard / Close up portrait of small, golden variety of a female Roughhead blenny (Acanthemblemaria aspera), photographed against the blue water, sticking out from its home in a tube on a coral reef. East End,...

Franco Banfi / Blue lined blenny (Helcogramma striata) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Panamic fanged blenny (Ophioblennius steindachneri) Malpelo Island National Park, UNESCO World Heritage Site, Colombia, East Pacific Ocean

Franco Banfi / Neon triplefin (Helcogramma striata) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Sue Daly / Black faced blenny (Tripterygion delaisi) female and male Sark, British Channel Islands, July.

Sue Daly / Butterfly blenny (Blennius ocellaris) Jersey, British Channel Islands, June.

Sue Daly / Butterfly blenny (Blennius ocellaris) Jersey, British Channel Islands, June.

Sue Daly / Tompot blenny (Parablennius gattorugine) Sark, British Channel Islands, August.

Nature Production / Leaping blenny (Alticus saliens) male, close-up, Mukojima, Ogasawara Islands UNESCO World Heritage Site, Japan

Tony Wu / Blenny (Neoclinus monogrammus) female, Shikoku, Japan.

Tony Wu / Spotted and barred blenny (Mimoblennius atrocinctus) portrait, Kashiwajima, Japan.

Tony Wu / Sculpin (Pseudoblennius zonostigma) with fins extended, Sado Island, Niigata, Japan.

Tony Wu / Blenny (Neoclinus monogrammus) male with his mouth wide open. Kashiwajima, Japan.

Nick Upton / Common prawns (Palaemon serratus) and a Shanny (Lipophrys pholis) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Common prawns (Palaemon serratus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, with a a Rock goby (Gobius paganellus) swimming past, Cornwall, England, UK, September.