 He was removed from his mother at birth, had his eyelids sewn shut, and had an electronic sonar device attached to his head—a Trisensor Aid, an experimental version of a blind travel aid, the Sonicguide—as part of a three-year sensory-deprivation study involving 24 infant monkeys.The experiments were designed to study the behavioral and neural development of monkeys reared with a sensory substitution device.Acting on a tip-off from a student, the ALF removed Britches from the laboratory on April 20, 1985, when he was five weeks old.