Whirligig Beetle
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Gyrinus natator
Common & widespread around Britain between May-September.
They are most conspicuous for their bewildering swimming.
They can be difficult to see if they are not moving or are under water.
Most species are coloured steely grey or bronze.
Their integument is finely sculpted with little pits; it is hard and elastic and produces a water repellent waxy outer layer, which is constantly supplemented. Among other functions, the lubricant layer and smooth outline make the beetles difficult to hold on to if caught.
The antennae are unusual among beetles, being short and plump, and placed about at water level.