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