Data for: Flexibility in the diel migratory schedule of an arctic songbird despite robust 24-h activity rhythms across the annual cycle

Data are measurements of daily activity from custom multisensor data loggers deployed on individual male snow buntings (Plectrophenax nivalis, a songbird) captured on Svalbard, Norway (78.2 °N, 15.8 °W) between 2017 and 2018. The R scripts used to analyze the data and obtain the results in the associated article are also provided. More information about the data and funding sources is available in Huffeldt et al. (2025) Journal of Avian Biology 2025: e03483, https://doi.org/10.1002/jav.03483.