Jan Hamrsky / Diving beetle larva (Hyphydrus ovatus), Europe, June. Controlled conditions.

Jan Hamrsky / Diving beetle (Haliplus ruficollis), Europe, June. Controlled conditions.

Jan Hamrsky / Diving beetle (Colymbetes fuscus) close up head portrait. Europe, June. Controlled conditions.

Yukihiro Fukuda,Yukihiro Fukuda / Japanese fireflies (Luciola cruciata) in flight at night, Japan endemic species, Hino-River, Nichinan-chou, Tottori, Japan, July

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva feeding on small fish. Czech Republic. Controlled conditions.

Stephen Dalton / Great Silver Water / Diving Beetle (Hydrophilus piceus) male. Sussex, UK, March.

Chris Shields / Illustration of Water ladybird (Anisosticta novemdecimpunctata / 19-punctata), winter form.

Solvin Zankl / Lars Hendrickson watching Black piston water beetles (Hydrophilus aterrimus) feeding on a tadpole, State Collection in Munich, Germany, June

Michael Durham / Diving Beetle (Cybister fimbriolatus) jumping into water, photographed with a high-speed camera, central Texas

Stephen Dalton / Seven spot ladybird {Coccinella septempunctata} drinking from water on leaf, UK

Kim Taylor / Water beetles (Dytiscus marginalis) and (Acilius sulcatus) clustered around an air bubble trapped beneath the ice of a frozen pond, digitally enhanced, Surrey, England

Solvin Zankl / Namib desert beetle / Fog Basking Beetle (Stenocara gracilipes) drinking droplets of water which gather on its body during the early morning fog over the dunes, Namib desert, Namibia

Kim Taylor / Whirligig Beetle (Gyrinus sp) on the surface of a pond. Surrey, UK

Jane Burton / Great Diving Beetle {Dytiscus marginalis} female taking air at water surface, Surrey, England.

Nick Garbutt / Synchronous fire flies (Pteroptyx sp.) mangroves along the Kinabatangan River, Sabah, Borneo.

Jan Hamrsky / Water scavenger beetles (Helochares obscurus), Europe, May. Controlled conditions.

Ann & Steve Toon / British diving beetles (Dytiscus sp.), museum specimens, Tyne and Wear Archives and Museums

Stephen Dalton / Whirligig beetles (Gyrinidae) on water surface, Florida, USA, February.

Michael Durham / Two Whirligig / Gyrinidae beetles (Dineutus sp) swimming on pond, Central Texas, USA, March.

Jan Hamrsky / Lesser diving beetles (Acilius sulcatus) mating pair, Europe, May, controlled conditions

Jan Hamrsky / Lesser diving beetles (Acilius sulcatus) mating pair, Europe, May, controlled conditions

Jan Hamrsky / Lesser diving beetles (Acilius sulcatus) mating pair, Europe, May, controlled conditions

Jan Hamrsky / Diving beetles (Graphoderus bilineatus) female (right) and male (left) Europe, August, controlled conditions

Jan Hamrsky / Diving beetles (Graphoderus bilineatus) female (left) and male (right) Europe, August, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) female, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) hiding in freshwater red algae (Batrachospermum moniliforme) Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) female, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) hind oar-like leg detail, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) refilling its air supply under the wing cases, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) female, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) refilling its air supply under the wing cases, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) refilling its air supply under the wing cases, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle larva (Dytiscus marginalis) feeding on tadpole, Europe, May, controlled conditions

Jan Hamrsky / Diving beetle larvae (Hyphydrus ovatus) Europe, July, controlled conditions

Jan Hamrsky / Diving beetle larva (Hyphydrus ovatus) Europe, July, controlled conditions

Jan Hamrsky / Diving beetle larva (Hyphydrus ovatus) Europe, July, controlled conditions

MYN / Matt Cole / Soldier beetle (Rhagonycha fulva) on a dew covered seed head, Leicestershire, England, UK, July. meetyourneighbours.net project

Yukihiro Fukuda / Japanese fireflies (Luciola cruciata) in flight at night, Japan endemic species, Hino-River, Nichinan-chou, Tottori, Japan, July

Will Watson / Great Diving Beetle (Dytiscus marginalis) female on Hornwort (Ceratophyllum demersum) UK, captive

Paul Hobson / Great diving beetle (Dytiscus marginalis) Sheffield, UK

Paul Hobson / Great diving beetle (Dytiscus marginalis) Sheffield, UK

Jan Hamrsky / Whirligig beetle (Gyrinidae) swimming on the water surface, Europe, June, controlled conditions

Jan Hamrsky / Whirligig beetle (Gyrinidae) swimming on the water surface, Europe, June, controlled conditions

Jan Hamrsky / Whirligig beetle (Gyrinidae) swimming on the water surface, Europe, June, controlled conditions

Jan Hamrsky / Whirligig beetle (Gyrinidae) swimming on the water surface, Europe, June, controlled conditions

Jan Hamrsky / Diving beetle (Hydroporus palustris) resting by the water surface, Europe, April, controlled conditions

Jan Hamrsky / Diving beetle (Hydroporus palustris),resting on the plant stem, Europe, April, controlled conditions

Will Watson / Great diving beetle (Dytiscus marginalis) larva eating a Three spined stickleback (Gasterosteus aculeatus), captive, Herefordshire, England, UK, June.

Will Watson / Great diving beetle (Dytiscus marginalis) larva eating a Three spined stickleback (Gasterosteus aculeatus), captive, Herefordshire, England, UK, June.

Will Watson / Great diving beetle (Dytiscus marginalis) larva eating a Three spined stickleback (Gasterosteus aculeatus), captive, Herefordshire, England, UK, June.

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Williams / Giant water lily (Victoria cruziana) Pantanal, Matogrossense National Park, Brazil. Flowers open at night to attract beetles to pollinate them. The flower is 10c warmer than its surroundings, this hel...

Paul Hobson / Close-up of Great Diving Beetle (Dytiscus marginalis). Derbyshire, July.

Paul Hobson / Great Diving Beetle (Dytiscus marginalis) at water surface. Derbyshire, June.

MYN / Niall Benvie / Great diving beetle (Dytiscus marginalis) larva, with prey, Scotland, UK, June meetyourneighbours.net project

MYN / Niall Benvie / Great diving beetle (Dytiscus marginalis) larva, with prey, Scotland, UK, June meetyourneighbours.net project

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva with open mouth parts. Europe, June.

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) at water surface. Europe, June.

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva with arthropod prey. Europe, June.

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva with arthropod prey. Europe, June.

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva with small fish prey. Europe, June.

Jan Hamrsky / Lesser Diving Beetle (Acilius sulcatus) larva portrait. Europe, August.

Jan Hamrsky / Lesser Diving Beetle (Acilius sulcatus) larva with breathing siphon touching surface. Europe, August.

Stephen Dalton / Great Silver Water / Diving Beetle (Hydrophilus piceus) male. Sussex, UK, March.

Stephen Dalton / Great Silver Water / Diving Beetle (Hydrophilus piceus) male. Sussex, UK, March.

Stephen Dalton / Saucer Bug (Ilyocoris cimicoides). Sussex, UK, March.

Stephen Dalton / Saucer Bug (Ilyocoris cimicoides). Sussex, UK, March.

Stephen Dalton / Saucer Bug (Ilyocoris cimicoides). Sussex, UK, March.

Will Watson / Male Great Diving Beetle (Dytiscus marginalis) on Soft Hornwort (Ceratophyllum submersum). Captive. Herefordshire, UK, August.

Stephen Dalton / Water Beetle (Acilius sulcatus) female swimming using legs adapted to be "oars". UK, September.

Stephen Dalton / Water Beetle (Acilius sulcatus) female underwater. UK, September.

Nick Upton / Pond skater / Water strider (Aquarius najas) pair in tandem, with male guarding female on the water surface of a mountain stream. Corsica, France, June.

Solvin Zankl / Black Piston water beetle (Hydrophilus aterrimus) [left] and Diving beetle (Dytiscus dimidiatus) [right] held in the hand, Europe

Will Watson / Male Lesser Diving Beetle (Acilius sulcatus) on Hornwort (Ceratophyllum demersum) Herefordshire, England, UK

Will Watson / Great Diving Beetle (Dytiscus marginalis) trying to couple with Great Diving Beetle (Dytiscus circumflexus) in an interspecies mating attempt, Herefordshire, UK.

Will Watson / Great diving beetle (Dytiscus circumflexus) on Soft Hornwort (Ceratophyllum submersum) in pond, captive, UK.

Will Watson / Male Great Diving Beetle (Dytyiscus marginalis) on Soft Hornwort (Ceratophllum submersum) in pond, Herefordshire, England, UK.

Will Watson / Two female Great diving beetles (Dytiscus circumflexus) on Soft Hornwort (Certophyllum submersum) in pond, captive, Shropshire, UK.

Will Watson / Female Lesser Diving Beetle (Acilius sulcatus), Worcestershire, England.

Will Watson / The underside of Great diving beetle (Dytiscus circumflexus) on Soft Hornwort (Ceratophyllum submersum) in pond, captive, UK.

Will Watson / Great Diving beetle (Dytiscus circumflexus) on Soft Hornwort (Ceratophyllum submersum) in pond, captive, UK.

Robert Thompson / Diving beetle (Dytiscus circumcintus) underwater, Montiaghs Moss NNR, County Antrim, Northern Ireland, UK

Robert Thompson / Diving beetle (Dytiscus circumcintus) underwater, Montiaghs Moss NNR, County Antrim, Northern Ireland, UK

Stephen Dalton / Great diving beetle (Dytiscus marginalis) feeding on worm prey, UK, controlled conditions

Stephen Dalton / Whirligig beetles (Gyrinus marinus) on water surface, UK

SINCLAIR STAMMERS / Water beetle (Nebrioporus elegans) Herefordshire, UK

SINCLAIR STAMMERS / Water beetle (Graptodytes pictus) Herefordshire, UK

Stephen Dalton / Great diving beetle (Dytiscus marginalis) male feeding on worm prey underwater, controlled conditions, UK

Stephen Dalton / Great diving beetle (Dytiscus marginalis) pair underwater, controlled conditions, UK

Stephen Dalton / Male Great diving beetle (Dytiscus marginalis) feeding on worm, UK

Michael Durham / Whirligig Beetle (Dineutus sp) group swimming in water, central Texas