Data for: Short photoperiods end autumn migration in a naïve diurnal migrant

<p>Data are measurements of daily mean flight activity, daily mean activity 1 h before lights off, and daily body mass from individual hatch-year dunnocks (<em>Prunella modularis</em>, a songbird) captured in southern Sweden (55.68 &deg;N, 13.43 &deg;E). Individuals were allocated to either a control or treatment group for investigating the influence of photoperiod on the dunnocks first autumn migration. The R script used to analyze the data and obtain the results in the associated article is also provided.&nbsp;</p> <p>More information about the data and funding sources is available in Huffeldt <em>et al.</em> 2024,&nbsp;<em>Animal Behaviour:</em> <a href="https://doi.org/10.1016/j.anbehav.2024.06.011" target="_blank" rel="noopener">https://doi.org/10.1016/j.anbehav.2024.06.011</a>.</p>