Study
Spray aiming in the bombardier beetle: photographic evidence
Eisner, Thomas; Aneshansley, Daniel J.
Proceedings of the National Academy of Sciences, 1999
Applied pinches to specific points on the beetle’s body and photographed the resulting discharge at high speed, recording where the spray was directed relative to the stimulus.
- Studied in
- Brachinus
- Sample size
- beetles photographed while being pinched at defined body sites
Beetles directed the discharge accurately towards the point being attacked, including over the back and to either side, by aiming the abdominal tip and using reflecting structures where the tip could not point directly.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
The defence is aimed rather than merely released, which considerably increases its effectiveness against a specific attacker.
How NatureHQ reads it
The detail that makes the beetle more impressive than the folklore. The interesting thing is not that the spray is hot — it is that a small insect being bitten on the leg can put a chemical pulse on that exact leg.
- Pinches with forceps are a simplified stimulus compared with a real predator.
- One genus, and aiming ability varies across bombardier beetles.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: Proceedings of the National Academy of SciencesPublished in PNAS.
doi.org/10.1073/pnas.96.17.9705
Checked against Crossref on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-03.