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 / Great diving beetle (Dytiscus marginalis) portrait, Europe, September, controlled conditions

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

Jan Hamrsky / Diving beetle larva (Platambus maculatus), Europe, February, controlled conditions

Will Watson / Head on view of Diving beetle (Cybister lateralimarginalis) resting among Bladderwort (Utricularia sp.) captive conditons, Belgium.

Will Watson / Diving beetle (Graphoderus cinereus) among Bladderwort (Utricularia sp.), captive, Belgium

Robert Thompson / Great diving beetle (Dytiscus marginalis) larva, Montiaghs Moss NNR, County Antrim, Northern Ireland, UK.

Will Watson / Diving Beetle (Rhantus exsoletus), Moccas Park National Nature Reserve, Herefordshire, England.

Will Watson / Diving bettle (Agaubus bipustulatus) taking air, Captive, Carmarthenshire, Wales, UK. July.

Will Watson / Diving Beetle (Colymbetes fuscus) resting on submerged log, captive, Herefordshire, England.