Supplement 2. Count data on migrating woodlarks at Hanko bird observatory.

File List Woodlark_data.txt Description The file Woodlark_data.txt is a tab-delimited ASCII file, containing count data on migrating woodlarks at Hanko bird observatory, during autumns 2007–2009. The migration period considered ranges from 1st September (day-of-year 245) to 10th of November (day-of-year 315). The first row is a heading line. Column definitions: Column 1, title DOY. The time of migration season expressed as day-of-year, from 1st September (day 245) to 10th of November (day 315). Checksum for DOY = 19880. Column 2, title Y07. Day specific number of observed migrating woodlarks in autumn 2007. Checksum for Y07 = 323. Column 3, title Y08. Day specific number of observed migrating woodlarks in autumn 2008. Checksum for Y08 = 361. Column 4, title Y09. Day specific number of observed migrating woodlarks in autumn 2009. Checksum for Y09 = 217.