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May 1988 GENERAL NOTES 379 (the same bat served as control and experim than unplugged. Bats also seemed more reluc of 2-5 times. For example, a bat that flew the ears of the same bat were plugged agai with plugged ears was 17.4 s (SD= 23; m median= 17). These results indicate greater d reliance on echolocation. Eonycteris spelaea of Batu Caves produc together; the sound is produced in dark sit while departing after dusk, and while forag echolocation, it is a primitive system. Eony exiting from dark sections of the cave; dec of bats with plugged tubes in their ears to s conclusion about echolocation impossible. Po from slowed flight. Decelerated flight may I thank University of Malaya faculty mem assistance and facilities. Financial support dation Grant BMS 7202337A01(GB-35609