A post-doctoral position is available at the U.S. Navy Marine Mammal Program to study the hearing abilities of and effects of sound on marine animals. APPLICATION TO THIS POSITION IS ONLY OPEN TO U.S. CITIZENS. Projects include developing acoustic impact criteria and safe exposure guidelines for marine animals, conducting behavioral and electrophysiological studies of hearing, investigating behavioral responses of marine mammals to sound, and determining the physiological effects of noise on the marine mammal auditory system (e.g., temporary threshold shifts). The applicant should possess a Ph.D. in acoustics, engineering, physics, experimental psychology (specializing in psycho-acoustics), or biology with a strong background in mathematics. For more information contact Jim Finneran, US Navy Marine Mammal Program, Space and Naval Warfare Systems Center, San Diego, Code 71510, 53560 Hull St., San Diego, California 92152-5001. E-mail: james.finneran@navy.mil