Bird banding is the practice of attaching small, individually numbered tags to the legs or wings of wild birds so that they may be identified and studied in the future. Information gleaned from banding includes data about migration, longevity, mortality, population, territoriality, and other aspects of avian life. The practice of marking birds dates back to the 3rd century BCE, but doing so for scientific purposes only began in 1899. What surprising facts have been learned through banding? Discuss
Source: The Free Dictionary