"A youngster gets a front row seat to witness mom chasing a strange squirrel out of "her yard". Mom doesn't relent until the invader is at least two yards away, and then waits to make sure it doesn't come back to forage in any of her usual food hiding spots. Any other squirrel actually daring to climb into her tree is rewarded with an especially harsh and noisy dispatching. She guards her brood and her territory quite zealously. You only notice these things after having sat for a while and watched what otherwise seems just a normal rustling in the leaves. "