Net-casting Spider (IMAGE) University of Nebraska-Lincoln Caption A new study from UNL biologists has revealed that the net-casting spider's secondary eyes -- the largest of any arachnid -- likely evolved in part to help it capture walking prey. Credit Courtesy Jay Stafstrom Usage Restrictions None 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.