Sue Daly / Topknot (Zeugopterus punctatus), swims out of the frame, Sark, British Channel Islands, UK, August.

Sue Daly / Topknot (Zeugopterus punctatus) camouflaged against rock. Gouliot Caves, Sark, British Channel Islands, July.

Sue Daly / Topknot (Zeugopterus punctatus) a type of flatfish. Gouliot Caves, Sark, British Channel Islands, August.

Christophe Courteau / Topknot camouflaged on seabed {Zeugopterus punctatus} Brittany France

Sue Daly / Topknot (Zeugopterus punctatus) close up of face, Channel Islands, UK July

Sue Daly / Topknot (Zeugopterus punctatus) close up of face, Channel Islands, UK July

Alex Mustard / 2020VISION / Topknot (Zeugopterus punctatus) flatfish camouflaged on seabed, Loch Fyne, Argyll, Scotland, UK, June

Alex Mustard / 2020VISION / Eye detail of Topknot (Zeugopterus punctatus) flatfish, Loch Fyne, Argyll, Scotland, UK, July

Alex Mustard / 2020VISION / Topknot (Zeugopterus punctatus) camouflaged, resting on bed of seaweeds, Babbacombe Bay, Devon, England, UK, April

Sue Daly / Topknot (Zeugopterus punctatus) camouflaged against habitat. Channel Islands, UK, June.

Jane Burton / Topknot {Zeugopterus punctatus} camouflaged on rocks covered in algae, showing left side with eyes on it, captive, from northern Europe

Jane Burton / Topknot {Zeugopterus punctatus} swimming, showing right side which is blind, captive, from northern Europe

Florian Graner / Topknot flatfish (Zeugopterus punctatus) camouflaged against seabed, Norway

Joel Sartore / Photo Ark / Common topknot (Zeugopterus punctatus) moving its fins, Aquazoo Loebbecke Museum, Dusseldorf. Captive.

Joel Sartore / Photo Ark / Close up of a Common topknot (Zeugopterus punctatus) head. The animal is looking at the camera. Aquazoo Loebbecke Museum, Dusseldorf. Captive.

Alex Mustard / Topknot (Zeugopterus punctatus) rests on the seabed, covered in tiny copepod parasites. Swanage, Dorset, England, United Kingdom. English Channel. North East Atlantic

Alex Mustard / Portrait of Topknot (Zeugopterus punctatus). Swanage, Dorset, England, United Kingdom. English Channel. North East Atlantic