It's a owl decoy used as a scarecrow for birds and rodents. By moving the decoy on a periodic makes it seem more realistic. Rodents will get used to the owl if it doesn't move.
This worked for us but it also scares away most birds. https://www.amazon.com/Gardeneer-Dalen-Natural-Scarecrow-Action/dp/B005J24R26/ref=sr_1_1?ie=UTF8&qid=1513980324&sr=8-1&keywords=solar+power+owl