Parcel delivery by drone is a thing of the past. Ten years after the launch of Amazon’s drone delivery service, the online retail giant is putting out feelers towards autonomous robots that can climb stairs. Amazon is taking over the Swiss start-up Rivr, which advertises its product on its own website with the slogan “We give one person the power of 1000”. Rivr CEO Marko Bjelonic announced the acquisition on Thursday via Linkedin.