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ABSTRACT
During an ecological study of Coluber jugular is and Malpolon monspessulanus in Israel, a comparatively low-cost radio-telemetric system was developed to automatically monitor body temperature and activity of free ranging snakes. The system operates in the 151 MHz band, and monitors from one to 59 snakes. Hardware includes: (1) implantable temperature-sensing transmitters; (2) a radio receiver; (3) an interface between computer and receiver; (4) a micro computer; (5) a cassette tape recorder; and (6) an A/D converter. Software includes BASIC and machine language programs that: (1) calibrate transmitters to temperature; (2) scan frequencies of radio-implanted snakes from 0600 to 1800 h daily, filter noises, determine at one minute intervals the body temperature and activity (moving/not moving) of the snakes, and record hourly the data on the cassette tape; and (3) read and process the recorded data.