Bird Banding Laboratory

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Day Codes

These codes are determined automatically when individual banding records are summarized for the data retrieval files. A day code of 1 indicates that the birds were banded during the first 5 days of the month, day code 2 during the second five days, and so on. A day code of 0 indicates that the day of banding was unknown or that the code was not calculated (1960 and earlier data do not have day codes).