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The objectives of the study were to use a biotelemetry system for continuous measurement of camel core body temperature and to use a system identification technique to model and simulate the core body temperature response to diurnal changes in ambient temperature. Air and core body temperatures of five Arabian camels were recorded every thirty minutes over a six days period. During the course of this study, camels maintained their temperature near a constant level ( 36.5 oC 0.4). Deep body temperature response to ambient air temperature was modeled using a system identification technique. A linear difference equation (ARX model) was used to build a mathematical model from measured input (air temperature) and output (core body temperature). The parameters of the ARX model were estimated using the least squares method. Quality of the model was evaluated by simulation with input from a new data set. The model output was in good agreement with the measured one where the root mean square difference between measured and simulated output was 0.58 oC.