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