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.

Jan Hamrsky / Diving Beetle (Rhantus suturalis). Czech Republic. Controlled conditions.

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.

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

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

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

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

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