Black-legged tick (IMAGE) Cary Institute of Ecosystem Studies Caption Black-legged ticks are spreading into new areas due to climate change, and they are bringing tick-borne diseases with them. Credit Credit: USDA. Usage Restrictions To promote this press 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.