Abstract
The use of radiotelemetry in studies of very small animals is still limited by the size of the transmitters and methods used to analyze spatial patterns in behavior. I developed a new telemetry transmitter with a mass of 260 mg and a new method to improve the spatial resolution of home-range analysis. With the smallest batteries, the complete tag has a mass of 390 mg and runs for 5-6 days, allowing radiotracking of flying animals with a body mass of ≥7 g. The transmitter has a pulse rate of 4-9 Hz that allows location within a few seconds. To record the use of food resources by tit species (Parus sp.) during the breeding season, I developed a technique to triangulate the birds'positions with high precision in spite of their frequent movements
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