Knee-tagging – a new marking technique for anurans

From 1979 to 1987 637 common frogs Rana temporaria have been marked by knee-tagging in a population in east-central Sweden. A small coloured and numbered plastic tag is tied to the knee with a stretchable thread allowing for limb growth. The loss rate of the tags after one year was estimated to be less than 10%. Properly applied tags have lasted for at least four years.