Animal Mitigation Shield Ameristar's animal mitigation shield can be securely mounted to the top of Matrix and Matrix Alpha systems. The animal shield provides a positive deterrent from nuisance animals entering into protected areas. The system can be easily installed along the upper most portion of the fence and gate system and throughout the entire perimeter including all corners and/or changes in fence direction. Our animal mitigation system has been evaluated and recommended by an accredited herpetologist for mitigating intrusion of nuisance animal’s i.e. snakes, raccoons, squirrels, iguanas, rodents of unusual size, possums, cat species & nutria. See attached pdf for the herptologist's letter.