Fig. 3: Boxplots representing the differences in tooth length (top), mean angle (middle) and max angle (bottom) depending on feeding ecological factors. First column: differences related to the main mechanical challenge; second column: prey hardness and third column: foraging substrate. Statistically significant differences are indicated by *. Groups in the same bracket are not significantly different but are different from groups with the asterisk (e.g., mean angle is different between hard and slippery, and long and slippery). ≈ indicates nearly significant result.