The great diving beetle, true to its name, is a rather sizable insect. The larvae can grow up to 60 mm in length, while the adults are generally between 27-35 mm. They live in fresh water, either still or slow running and seem to prefer water with vegetation.They are dark-coloured (brown to black) on their back and wing cases (elytra) and yellow on their abdomen and legs. The male's wing cases are shiny while those of the female are finely grooved. A voracious predator, this beetle hunts a wide variety of prey, including other insects, tadpoles, and small fish. They are able fliers, usually at night, when they use the reflection of moonlight to locate new water sources, this location method can sometimes cause them to land on wet roads or other hard wet surfaces.