Beseiged by Squirrels: Modern Fantasy

"Mom, come here! You've got to see this!" Lisa called out. She didn't take her eyes off the window.

Her mom came in. "What is it?"

"Look!"

Outside the window, their old oak tree was covered with squirrels. They had two that always lived on it, but now there were dozens swarming around the thick trunk, crawling out on the branches, eating the acorns, and generally coating the tree from stem to stern. Her mom whitened when she saw the squirrels, then looked to the sky. Lisa hadn't looked up until then, but she followed her mom's gaze. The sky was thick with songbirds swirling over their house.

"Come on, baby," her mom said, "we've got to get out of here. I haven't seen this in the twenty years that I've lived here, but my mama told me about what happened--"

Inspiration: I am besieged by squirrels.
Story Potential: Low.
Notes: Maybe this is what happens when a dryad is about to come out? Maybe dryads aren't the nice friendly creatures we've always thought them? Something along those lines.