Living along the parade route in a small village is often an invitation for unexpected visitors on Memorial Day, so I usually keep a few extra beers and cold cuts in the fridge. But long after the festivities yesterday, I entertained a small crowd of the most unusual guests who required neither a cold brew nor a quick bite. Perched in the large sugar maple growing just a few feet from both my front porch and the road were seven pint-sized screech owls.