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).