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Many species in the seabird family<jats:italic>Alcidae<\/jats:italic>undergo a synchronous molt of all primary flight feathers during the non\u2010breeding season, making them flightless and more susceptible to environmental stressors, including severe storms and prey shortages. However, the timing and location of molt remain largely unknown, with most information coming from studies on birds killed by storms or shot by hunters for food. Using light\u2010level geolocators with saltwater immersion loggers, we develop a method for determining flightless periods in the context of the annual cycle. Four Atlantic puffins (<jats:italic>Fratercula arctica<\/jats:italic>) were equipped with geolocator\/immersion loggers on each leg to attempt to overcome issues of leg tucking in plumage while sitting on the water, which confounds the interpretation of logger data. Light\u2010level and saltwater immersion time\u2010series data were combined to correct for this issue. This approach was adapted and applied to 40 puffins equipped with the standard practice deployments of geolocators on one leg only. Flightless periods consistent with molt were identified in the dual\u2010equipped birds, whereas molt identification in single\u2010equipped birds was less effective and definitive and should be treated with caution. Within the dual\u2010equipped sample, we present evidence for two flightless molt periods per non\u2010breeding season in two puffins that undertook more extensive migrations (&gt;2000\u2009km) and were flightless for up to 77\u2009days in a single non\u2010breeding season. A biannual flight feather molt is highly unusual among non\u2010passerine birds and may be unique to birds that undergo catastrophic molt, i.e., become flightless when molting. Although our conclusions are based on a small sample, we have established a freely available methodological framework for future investigation of the molt patterns of this and other seabird species.<\/jats:p>","DOI":"10.1002\/ece3.9579","type":"journal-article","created":{"date-parts":[[2022,12,13]],"date-time":"2022-12-13T09:00:26Z","timestamp":1670922026000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["A new biologging approach reveals unique flightless molt strategies of Atlantic puffins"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9757-7150","authenticated-orcid":false,"given":"Jamie Hendrick","family":"Darby","sequence":"first","affiliation":[{"name":"School of Biological, Environmental and Earth Sciences University College Cork Cork Ireland"},{"name":"MaREI Centre for Energy, Climate and Marine, Environmental Research Institute University College Cork Cork 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