Abstract: A sonic device, adapted to be carried by a predatory animal is provided. The device emits a sonic signal either continuously or intermittently with a predetermined interval and duration. The device is controlled by a microprocessor (2) which is programmable to emit appropriate signals. The device may be temporarily deactivated by a location switch (12) when the predatory animal enters a defined location, such as a domestic environment, or by an optical switch when the ambient light intensity falls below a particular threshold level. The device includes a waterproof housing and a battery power source and may also include one or more solar panels.