How hard can insects bite? Having a strong chewing apparatus makes it easier to crush harder food and to succeed in fights with enemies. Biologists at the University of Bonn now present a mobile system (forceX) for measuring the bite forces of small animals, along with the software forceR to evaluate the data. This allows to understand how bite forces, for example of insects, evolved. The final version is now published in the journal „Methods in Ecology and Evolution“.