A continental study of Whistling Swans using neck collars
Using coded colour neck collars increased the resighting rate of Whistling Swans Cygnus c. columbianus as individuals to as much as 90%, compared with less than 5% by conventional band methods, even after a migration across N. America. Details of the continental marking protocol for four swan species are given. Much public interest and co-operation has resulted from the use of collars.
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