Timber Rattlesnake (IMAGE) Penn State Caption Timber rattlesnakes, which are a species of conservation concern in Pennsylvania and threatened or endangered in other states, play an important role in the ecosystem and are associated with decreased levels of Lyme disease. Additionally, their venom is used in anticoagulants and other medical treatments. Credit Julian Avery, Penn State Usage Restrictions Credit must be provided. 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.