The flash of a white, furry belly soars over my head. It is luminous against the backdrop of the nighttime sky. I duck as another small form soars past me with all four legs extended in flight, like a tiny caped superhero. A shrill, high-pitched warning squeak blasts from the pine tree beside me. As a heavy cloak of black velvet envelopes the evening and I round the last bend of my walk, the flying squirrels descend and commence their nightly plunder of my bird feeders.