Remi Masson / Group of Black bullhead (Ameiurus melas) shoaling to protect themselves against predators, River Rhone, Rhone-Alpes, France, July.

Alex Mustard / Red Irish lord (Hemilepidotus hemilepidotus) resting on a yellow sponge, in front of red soft coral (Eunephthya rubiformis). Browning Pass, Port Hardy, Vancouver Island, British Columbia. Canada. Nor...

Bert Willaert / Composite image of American fish species introduced to Europe: Pumpkinseed sunfish (Lepomis gibbosus, left), Brown bullhead (Ameiurus nebulosus, right) and Eastern mudminnow (Umbra pygmaea, under), ph...

Michel Roggo / Bullhead (Cottus gobio) Europe

Fred Bavendam / Crested Bullhead Shark (Heterodontus galeatus), New South Wales, Australia

Shane Gross / Shorthorn sculpin (Myoxocephalus scorpius) hiding in Kelp. Terra Nova National Park, Newfoundland, Canada. May.

Shane Gross / Shorthorn sculpin (Myoxocephalus scorpius) swimming over seagrass bed. Terra Nova National Park, Newfoundland, Canada. May.

Shane Gross / Shorthorn sculpin (Myoxocephalus scorpius) sheltering in seagrass bed. Terra Nova National Park, Newfoundland, Canada. May.

Alex Mustard / Long-spined sea scorpion (Taurulus bubalis) hides amongst white plumose anemones (Metridium dianthus) on the Wreck of the Rosalie. Weybourne, north Norfolk, England, United Kingdom. North Sea.

Alex Mustard / Eye detail of a long-spined sea scorpion (Taurulus bubalis). Lochcarron, Ross-shire, Ross and Cromarty, Highlands, Scotland, United Kingdom. Loch Carron, North East Atlantic Ocean.

David Hall / Red Irish lord sculpin (Hemilepidotus hemilepidotus) camouflaged amongst Plumose anemones (Metridium senile), red soft coral (Gersemia rubiformis), various sponges, bryozoans and calcareous tubeworms....

David Hall / Red Irish lord fish (Hemilepidotus hemilepidotus) among Sulfur Sponge (Myxilla lacunosa) Browning Pass, Queen Charlotte Strait, British Columbia, Canada. May.

David Hall / Red Irish lord fish (Hemilepidotus hemilepidotus) with Pygmy rock crab (Cancer oregonensis). Seven-Tree Island, Browning Pass, British Columbia. September.

David Hall / Red Irish lord fish (Hemilepidotus hemilepidotus) with Plumose anemones (Metridium senile) Seven-tree Island, Browning Pass, Queen Charlotte Strait, British Columbia, Canada. May.

Shane Gross / Galapagos Bullhead Shark (Heterodontus quoyi) scavenging a dead fish, Tagus Cove, Isabela Island, Galapagos, Ecuador. December.

Pascal Kobeh / Shorthorn or Arctic sculpin (Myoxocephalus scorpius) Russia. White Sea.

Nick Hawkins / Atlantic sea raven (Hemitripterus americanus) along the off Nova Scotia, Canada. July.

Nick Hawkins / Atlantic sea raven (Hemitripterus americanus) along the off Nova Scotia, Canada. July.

SCOTLAND: The Big Picture / Long spined scorpion fish (Taurulus bubalis) camoflouged, Sula Sgeir, Scotland.

SCOTLAND: The Big Picture / Scorpion fish amongst hydroids (Taurulus bubalis) Loch Etive, west coast of Scotland, UK, August.

SCOTLAND: The Big Picture / Long spined sea scorpion (Taurulus bubalis), John O' Groats, North Scotland, UK, May.

Robert Thompson / Long spined sea scorpion (Taurulus bubalis) Ballywhoriskey Point, Fanad Peninsula, County Donegal, Ireland, April.

Remi Masson / Shoal of Black bullhead (Ictalurus melas) in a lake. Alps, France

Remi Masson / European bullhead (Cottus gobio) camouflaged among rocks and aquatic plants, Ain, Alps, France

Remi Masson / Two European bullhead fish (Cottus gobio) hiding among rocks in small river, Ain, Alps, France

Remi Masson / European bullhead (Cottus gobio) on riverbed of small river, Ain, Alps, France, May.

Tony Heald / Egyptian goose (Alopochen aegyptiaca) pair amongst Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia, March.

Tony Heald / White-backed vulture (Gyps africanus) sunbathing amongst Devil's-thorn yellow flowers (Tribulus terrestris), Etosha National Park, Namibia, March.

Tony Heald / Klein Okevi waterhole covered by Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia, March 2016

Tony Heald / Black-faced impala (Aepyceros melampus petersi) young male Lying in Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park Namibia, March.

Tony Heald / Black-faced impala (Aepyceros melampus petersi) female leaping above Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia.

Tony Heald / Lion (Panthera leo) male, walking amongst Devil's-thorn yellow flowers (Tribulus terrestris) Etosha National Park, Namibia.

SCOTLAND: The Big Picture / European river otter (Lutra lutra) carrying a Scorpionfish (Taurulus bubalis) ashore, Shetland, Scotland, UK, March.

Richard Du Toit / Dubbeltjie flowers (Tribulus terrestris) with Lion (Panthera leo). Kgalagadi Transfrontier Park, South Africa, February.

Loic Poidevin / White stork (Ciconia ciconia) eating Black bullhead (Ameiurus melas) Vendee, France, July

Neil Aldridge / White stork (Ciconia ciconia) in grassland, Mapungubwe National Park, South Africa.

MYN / Paul van Hoof / Bullhead (Cottus perifretum) adult, The Netherlands, February. meetyourneighbours.net project

MYN / Paul van Hoof / Bullhead (Cottus perifretum) adult, The Netherlands, February. meetyourneighbours.net project

Franco Banfi / Portrait of red irish lord (Hemilepidotus hemilepidotus), Alaska, United States, North Pacific Ocean.

Ann & Steve Toon / Ground squirrel (Xerus inauris) feeding in Devil's thorn flowers (Tribulus terrestris) Kgalagadi Transfrontier Park, Northern Cape, South Africa. Non-ex.

Pascal Kobeh / Close-up of a Red Irish lord (Hemilepidotus hemilepidotus), Alaska, USA, Gulf of Alaska. Pacific ocean.

Pascal Kobeh / Close-up of the head of a Red Irish lord (Hemilepidotus hemilepidotus), Alaska, USA, Gulf of Alaska. Pacific ocean.

Pascal Kobeh / Red Irish lord (Hemilepidotus hemilepidotus), Alaska, USA, Gulf of Alaska. Pacific ocean.

Sue Daly / Long-spined sea scorpion (Taurulus bubalis) resting on pebbles, Sark, British Channel Islands, UK, August.

MYN / Krista Schlyer / Brown bullhead (Ameiurus nebulosus), Anacostia watershed, Washington DC, USA, April. Meetyourneighbours.net project.

Sue Daly / Eggs of Long-spined sea scorpion (Taurulus bubalis) on sea shore, possibly being predated by Painted Topshell, Guernsey, British Channel Islands

Richard Du Toit / Lion (Panthera leo) in Dubbeltjie flower (Tribulus terrestris) Northern Cape Province, South Africa, February.

Brandon Cole / Horn Shark (Heterodontus francisci) resting on the seabed, Channel Islands National Marine Sanctuary, California, USA, August.