Field biologists are increasingly turning to camera traps to collect data. The set-up is really simple: when an animal passes in front of a camera, an infrared sensor becomes activated, and the camera silently snaps a photo. Sometimes - especially for camera traps designed to detect nocturnal species - an infrared flash, invisible to most mammals and birds, is used.
The photographs generated from camera traps can then provide researchers with far more data than they would be able to collect themselves with more traditional field observations. Often, this allows them to generate photographic evidence of a species' natural behaviors without the confounding effects of direct human observation. It allows them to collect data continuously, throughout the day and night. And a camera trap can help researchers collect evidence of rare species or rare behaviors, as was demonstrated last week when a camera trap captured a golden eagle preying upon a sika deer. Or they could help researchers come face-to-face with an animal that might otherwise be dangerous or harmful. An array of camera traps is also more cost efficient than paying an army of field assistants to observe animal behavio or to conduct a census.
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