Radio tracking of small mammals using a grid of overhead wire antennas

Abstract
A radiotelemetry system is described that can be used to monitor three activity states of, and distance travelled by, mammals as small as Clethrionomys gapperi, having a winter weight of 16 g. Precision with which animals are located is constant and error does not exceed 75 cm. Preliminary biological results show marked seasonal changes in activity patterns. Advantages and disadvantages of the grid of fixed antennas vis à vis triangulation systems are discussed and other potential uses of the system are suggested.

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