Summary
A new simple ultrasonic system is described with which whirring and hopping, expressions of noctural migratory activity in captive birds, can be measured. Pronounced differences are found if the results are compared with those from the most often used perch-microswitch system, which responds only to hopping.
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Biebach, H., Wegner, H. & Habersetzer, J. Measuring migratory restlessness in captive birds by an ultrasonic system. Experientia 41, 411–412 (1985). https://doi.org/10.1007/BF02004533
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DOI: https://doi.org/10.1007/BF02004533