This study by Desholm et al. assesses the degree of usefulness and limitations of remote technologies for studying bird behavior in relation to bird-turbine collisions at offshore wind farms. It primarily focuses on radar and Thermal Animal Detection System (TADS) but also covers video surveillance equipment, microphone systems, laser range finder, ceilometers, and pressure sensors. Although radar cannot measure bird-turbine collisions directly, it is a powerful tool for quantitatively describing the movement of birds in 3-dimensional space and generating helpful models. TADS, on the other hand, can provide specific information about collision rates and is helpful for investigating avoidance behavior, flock size, and flight altitude of birds near turbines. (PDF, 280 KB)