Urine Chemicals and Hiding Mud Crabs (image) Georgia Institute of Technology Share Print E-Mail Caption Mud crabs hiding in reaction to chemicals taken from blue crab urine and introduced into their tanks in a lab at Georgia Tech. Credit Georgia Tech / Alex Draper Usage Restrictions Free for use on reporting on research at the Georgia Institute of Technology. Share Print E-Mail 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.