WOLF SPIDERS (IMAGE) University of Cincinnati Caption WOLF SPIDERS SENSE SOUND BY DETECTING VIBRATIONS IN THEIR LEGS. THEY OFTEN FREEZE AT THE JARRING CALLS OF BLUE JAYS AND OTHER BIRDS. Credit JOSEPH FUQUA II Usage Restrictions NONE License Original 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.