Fig. 4.

Influence of the fly’s impact side onto the fluid on its death probability. Flies were predicted to be killed in greater proportions when they impacted the fluid on their back (dorsal surface) than on the right position (ventral surface). Sample numbers are indicated. According to the Fisher’s exact tests, this effect was only significant for non-viscoelastic fluids for which it increased with fluid acidity, illustrating the results of the statistical tests that were performed in the logistic regression (interaction FallOrientation × pH).