RFID tags small enough to be carried by a bee have a very small read range - inches at best.
Harmonic radar has had limited success. Our experience is that the required antenna affects the bees natural flight patterns, although Riley had better success with the larger bumble bees. A US study using Riley’s tags on worker honey bees bees noted that the honey bees flew in straight lines, seldom turning. That says a lot about the validity of the experiment. We put the first RFID on a honey bee, on the early 2000s, decided it altered bee flight.
Miniature RFIDs on bees do work far better, but read range is so short, the tags can only be read by readers mounted in the hive or at the entrance or at a feeder or some position very close to the tagged bees. That’s why we spent years developing our tagless LIDAR for tracking and mapping bees.
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