Since the scratching sound occurred during the day, general internet wisdom was able to determine that it was probably a squirrel. I think I would prefer the tiger. My father spent much of his retirement trying to prevent squirrels from eating the food that he lovingly provided for songbirds, and after a long battle of wits, he had constructed some pretty elaborate squirrel counter measures. The day he saw his nemesis scale a greased pole, traverse the electrified razor wire, leap through the burning hoop to steal the bird seed, all while avoiding dad's air rifle barrage, convinced my father he was no match for this ingenious and innovative creature.
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Stephen R. Drage