Abstract
A miniature microphone was integrated into a telemetry transmitter package with a total weight of 1.2 grams (operating life of 7 days) or 2.0 grams (21-day life). To obtain meaningful acoustical information, the radio transmitter is continuous transmission, rather than the pulsed type typically used for wildlife telemetry. It is sensitive enough to pick up bird songs at a distance of over 30 m and small airplane engine sounds at several kilometers. This device is useful for remote monitoring in inaccessible locations and to avoid the intrusive impact of direct observation by humans. It can be used to document acoustical environment and auditory stimuli and to monitor vocalizations and behavior of the animal on which the transmitter package is mounted. Applications include studying behavior and responses to disturbance. The transmitter has been successfully used to monitor bird calls and wing-beat patterns during various types of activity, including foraging and nighttime migration flights.
Published Version
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