Data from: Arctic geese in newly colonised, colder breeding areas have higher spring body mass and breed earlier relative to the onset of spring

This dataset contains all data to reproduce the results in the publication "Arctic geese in newly colonised, colder breeding areas have higher spring body mass and breed earlier relative to the onset of spring". Biometric data of geese captured in Norway and Finland can be accessed from another repository (submit.cr-birding.org, formerly www.geese.org) and individual GPS-tracks can be accessed from www.movebank.org (MovebankID: 565124314).