Scarecrow, nope. A scareowl.

To keep pigeons off roofs and ledges, folks often resort to using plastic owls as a type of "scarecrow" meant to banish the troublesome bird pests. The London Free Press had one; Pesky birds still built nests in the large company sign mounted on the paper's east wall. The owl pictured was set on the roof of an area hairdressing salon. Local birds didn't seem to take much notice.