Almost up to PhD level (piled high and deep). Not the best day to be a squirrel (or anyone else for that matter relying on travel by foot). Squirrels move through the snow in high hops until they eventually stomp the snow flat enough to create a path. On the downstroke of each hop they end up submerged, with nothing visible to the casual observer but tail and ear tips). Squirrels are at a distinct evolutionary disadvantage under such conditions. Pax, for example, with his longer wheel-base can move through the drifts much faster. Knowing this, I bang on the garage door prior to opening it so the freeloaders under the bird feeder are warned and can get a head start. Pax would have caught several anyway, if he had really tried.