Figure 4. Microwear data for modern frugivorous tree squirrels and herbivorous to omnivorous ground squirrels. (A) Mean and 1 standard deviation of the number of pits (blue) and number of scratches (red) for each species (with all species of Ratufa combined due to small sample sizes). (B) Scatterplot of mean values in (A). Ground squirrels show a higher frequency of pits per unit area than do frugivorous tree squirrels. Means also shown for two fossil ground squirrel species (brown). (C) Percent of specimens with large pits (blue) and gouges (green). Ground squirrels more often show coarse features than do frugivorous tree squirrels.