Mourning gecko (IMAGE) University of Southern California Caption A lizard species known as a mourning gecko can regenerate its tail, but the replacement is an imperfect copy of the original. Credit USC/Lozito Lab Usage Restrictions Credit must be given to the creator. License CC BY 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.