For years, scientists have kept track of who’s who by attaching colored bands to birds’ legs and then keeping a vigilant eye out for the marked bird to return.
Now, a technology called RFID (radio frequency identification) is automating that vigilance, and yielding more detailed information than scientists ever dreamed possible. A recent study at the Cornell Lab kept track of 129 separate songbirds on a staggering 650,000 individual feeder visits over a period of 5 months (see “What We’ve Learned Already,” below). Instead of pulling 24-hour vigils, the scientists needed to spend only about 6 hours per week tending these wired feeders.
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