Flight initiation distance
We found FIDs were repeatable (R = 0.29; 95% CI [0.172, 0.409]). Human activity within an individual’s home site predicted its FID; squirrels experiencing greater human activity had shorter FIDs; i.e., were bolder (Table 1; Fig. 2A). Highly trappable individuals also had shorter FIDs than less trappable individuals (Table 1; Fig. 2B). Females had shorter FIDs than males (Table 1). FIDs increased with group size (Table 1; Fig. 2C) suggesting squirrels were quicker to flee from an approaching human when more conspecifics were present. We also found that squirrels had longer FIDs with longer starting distances (Table 1).