https://arstechnica.com/cars/2019/01/amazon-begins-testing-deliveries-with-sidewalk-drones/

Amazon said on Wednesday that it will start delivering packages using a six-wheeled sidewalk robot called Amazon Scout.

"Starting today, these devices will begin delivering packages to customers in a neighborhood in Snohomish County, Washington," the company's announcement says—that's just north of Seattle. Amazon says that its robots "are the size of a small cooler and roll along sidewalks at a walking pace."