Will Watson / Lesser silver diving beetle (Hydrochara caraboides), captive, Cheshire, England, UK, July.

Will Watson / The Cherrystone Beetle (Hyphydrus ovatus) resting on Hornwort (Ceratophyllum demersum) Herefordshire, England. Captive.

Jan Hamrsky / Lesser silver water beetle larva (Hydrochara caraboides) Europe, June, controlled conditions

Jan Hamrsky / Lesser silver water beetle larva (Hydrochara caraboides) breathing by the surface, Europe, June, controlled conditions

Jan Hamrsky / Lesser silver water beetle (Hydrochara caraboides) with bubble of air on its underside, Europe, June, controlled conditions

Jan Hamrsky / Lesser silver water beetle larva (Hydrochara caraboides) pushing its prey out of the water to immobilize it, Europe, June, controlled conditions

Jan Hamrsky / Lesser silver water beetle larva (Hydrochara caraboides) with Backswimmer nymph prey, Europe, June, controlled conditions

Jan Hamrsky / Lesser silver water beetle larva (Hydrochara caraboides) head detail, Europe, June, 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

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