Check the listing for details. Bird Distress cd Alarm calls Starlings, Crows,Grackle, Red Tail Hawk. Condition: New. Listed at 14.50 USD. Bird Distress Calls cd Audio Control cd - Starling, Crows, Grackle, Red Tail, Goshawk Use a CD, media player or similar sound system. Install speakers as high as possible and away from infestation / roosting areas. Install additional speakers + visual devices at strategic locations to discourage potential roosting elsewhere. Camouflage speakers using wood siding, tree bark, etc. Combine with visual devices Various starling, crow, grackle alarm / distress + red-tail, goshawk sounds occur intermittently throughout the 35 minute CD. LOUD sounds typically distort avian auditory reception. Experiment at low volume and adjust as necessary. All scare Audio & Visual Bird Deterrents work best when used in combination with each other as they increase the birds fear and flight response to the perceived predator threat.