Identification of Small Animals by Proximity Sensing

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Science  24 Nov 1961:
Vol. 134, Issue 3491, pp. 1694-1696
DOI: 10.1126/science.134.3491.1694


Individual deer mice are identified by magnetic proximity sensing. Approach of an animal wearing a small ferromagnetic collar unbalances an excited inductance bridge which triggers recording circuitry. In conjunction with conductance proximity sensing, the techniques can identify four individuals. Some results on the tendency of two females to follow one another are cited.