Revenge of the Leaf Blowers? probably some animal preparing for winter,very few able to winter in Florida, however if you are in a mild winter state, some animal practicing for a trip north. (were you planning a trip north? animals have been known to be able to sense these things) Once looking at a used car on a dealer's lot in Brisbane Australia, on lifting the hood a good 5 gallon buckat full of either seeds or nuts poured out near a flat portion of the interior bodywork. Many motor cycle owners have been surprised on fitting their motor cycles for the riding season, after a winter lay-up, finding evidence of mice nests in seats, (expensive) some even in the air cleaner, although in those cases they made use of the original material and did not have to bring their own. Hope it did not do any damage to the engine.