Fox and Opossum (IMAGE) Cary Institute of Ecosystem Studies Caption Top-down control -- Fox and opossums were associated with a reduction in tick infection. Fox prey on the rodents know to transmit tick-borne disease to feeding ticks; opossums are efficient at killing ticks when they groom. Credit Sandy Brown Jensen, Dennisicecap1 Usage Restrictions May be used to promote this release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.