Encourage birds into your gardenby keeping cats outeffective over an area of 125 square metrestested and approved by the rspbmeasures h16xw78xd57cmshortcode tabdescriptionmany garden birds are under threat and cats are part of the reason you cant blame them cats hunt instinctively but you can deter them with catwatch the only feline deterrent tested and approved by the rspb it detects a cats presence with a passive infrared sensor this triggers a modulating series of ultrasonic