|Brachinus crepitans, Museum specimen|
Brachinus crepitans is a species of ground beetle in the Brachininae subfamily that can be found everywhere in Europe, except for Monaco, Norway, San Marino, Vatican City, and some islands such as Cyclades, Gibraltar, Iceland, Madeira, Malta, North Aegean, Novaya Zemlya, and Savage Islands.  It can also be found in every Central Asian and Middle Eastern country except for Afghanistan. North African countries have them too.
Brachinus crepitans can reach a length of 7–10.2 millimetres (0.28–0.40 in), with an average of 8 millimetres (0.31 in). Head and protum are brown, while elytrae are greenish. The species is very similar to Brachinus efflans.
Most of the time the species can be found in southern England and southern Wales where its abundant in coastal areas. The inland locations have been sited as well through, the most recent of which are Cotswolds and Northamptonshire where it was discovered in limestones. It was also found in boulder clay in Huntingdonshire, and in Brotheridge Green, an old railway line and wildlife reserve that was located near Malvern, Worcestershire. The species were found in the 1970s by Ian L. Crombie.
The species fly from May to June. The lifecycle is not known but the larvae are thought to be external parasites that feed on the pupae of other beetle species including Amara convexiuscula and a staphylinid beetle, Tasgius ater (Gravenhorst, 1802).
When disturbed, the species shoot liquid from two glands through their anus. Since one of the glands contains hydrogen peroxide and the other hydroquinone, when two the contents mix with enzymes in a "firing chamber", the liquid explodes, and harms the attackers.
- "Brachinus (Brachinus) crepitans (Linnaeus, 1758)". Carabidae.org. September 20, 2011. Retrieved December 28, 2012.
- "Brachinus (Brachinus) crepitans (Linnaeus, 1758)". 2.6.2. Fauna Europaea. August 29, 2013. Retrieved October 20, 2013.
- "Bombardier beetle (Brachinus crepitans)". ARKive. Retrieved December 28, 2012.
- "Bombardier Beetle Brachinus Crepitans Found Near Honeybourne". WBRC. Retrieved December 28, 2012.