Hearing Sensitivity in Bats

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Abstract
Absolute hearing thresholds for two bats were determined by an operant conditioning technique. Pure tones ranging from 2.5 to 100 kilocycles per second were perceived by a single Eptesicus fuscus . Its maximum sensitivity was on the order of 68 decibels below 1 dyne per square centimeter and occurred at 20 kc/sec. Maximum sensitivity for a single Myotis lucifugus was about 64 db below 1 dyne/cm 2 and occurred at 40 kc/sec. The Myotis clearly heard a tone of 120 kc/sec but gave no evidence of hearing below 10 kc/sec.

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