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(a) An example of a PIT tag, here embedded in a leg band and attached to a blue tit. (b) Waterproof box containing the radio‐frequency identification (RFID) logger mounted on a tree (left side) with antennas placed in front of the nest box opening. (c) Inner side of the RFID box, containing the battery holder, RFID data logger circuit, and a 1 GB memory stick for data storage and programing
