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Among Procellariiform seabirds, petrels exhibit a wide range of foraging strategies finely tuned to the patchy and unpredictable distribution of resources. The extent and remote nature of their foraging grounds makes direct observation of foraging behaviour impractical, thereby requiring the use of remote tracking technologies. We deployed miniaturised multi\u2010sensor biologgers and collected fine scale movement data to investigate the at\u2010sea behaviours of the Bermuda petrel\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Pterodroma cahow<\/jats:italic>\n                    <\/jats:styled-content>\n                    , a poorly studied and highly threatened gadfly petrel, specialised on mesopelagic prey. GPS\u2010tracking data revealed extensive foraging trips (mean\u2009\u00b1\u2009SD: 1207\u2009\u00b1\u2009305\u2009km), in consistent directions, over remote oceanic regions. Time\u2010depth\u2010recorders provided new insights into Bermuda petrel feeding techniques suggesting that the meso\u2010bathypelagic prey targeted by petrels must be available in the very upper layer of the water surface, given their very limited diving activity (maximum dive depth of 1.57\u2009m). We identified three flight\u2010related and three water\u2010associated behaviours using supervised classification approach to classify behaviour from tri\u2010axial acceleromtetry. Flying behaviours reflected the expected dynamic soaring flight strategy of Procellariiformes; individuals spent more than 75% of their time in flight (dynamic soaring and flap\u2010gliding) with dynamic soaring flight being the most common behaviour under all conditions. The behaviour classified as \u2018Intensive flight\u2019 was infrequently observed but could indicate aerial dipping, a characteristic foraging technique of\n                    <jats:italic>Pterodroma<\/jats:italic>\n                    species. The remaining time was spent in three water behaviours: active, inactive and intensive, with the latter being less common but thought to reflect scavenging and prey seizing. Flight increased during dusk and in the night, highlighting greater flight activity during night compared to the day, while water behaviours were more common during the day. While some of our findings may require further validation to confirm their relevance to foraging behaviour, our work offers new and valuable insights to consider when assessing the ecological needs of this endangered species and its potential vulnerability to offshore anthropogenic activities.\n                  <\/jats:p>","DOI":"10.1002\/ece3.71647","type":"journal-article","created":{"date-parts":[[2025,7,13]],"date-time":"2025-07-13T11:51:02Z","timestamp":1752407462000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fine\u2010Scale Movement Data Reveal Primarily Surface Foraging and Nocturnal Flight Activity in the Endangered Bermuda Petrel"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2145-6667","authenticated-orcid":false,"given":"Paolo","family":"Becciu","sequence":"first","affiliation":[{"name":"Department of Ecology and Evolution University of Lausanne  Lausanne Switzerland"},{"name":"Ornis Italica  Roma Italy"},{"name":"Swiss Ornithological Institute  Sempach Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9931-2693","authenticated-orcid":false,"given":"Allison","family":"Patterson","sequence":"additional","affiliation":[{"name":"Wildlife Research Division Environment and Climate Change Canada  Dartmouth Nova Scotia Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4996-7074","authenticated-orcid":false,"given":"Carina","family":"Gjerdrum","sequence":"additional","affiliation":[{"name":"Canadian Wildlife Service  Dartmouth Nova Scotia Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeremy","family":"Madeiros","sequence":"additional","affiliation":[{"name":"Department of Conservation Services Ministry of the Environment  Flatts Bermuda"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6319-6931","authenticated-orcid":false,"given":"Letizia","family":"Campioni","sequence":"additional","affiliation":[{"name":"Ornis Italica  Roma Italy"},{"name":"MARE\u2014Marine and Environmental Sciences Centre\/ARNET\u2014Aquatic Research Network Ispa\u2014Instituto Universit\u00e1rio  Lisboa Portugal"},{"name":"Departamento de Biolog\u00eda de la Conservaci\u00f3n y Cambio Global Estaci\u00f3n Biol\u00f3gica de Do\u00f1ana, Consejo Superior de Investigaciones Cient\u00edficas (EBD\u2010CSIC)  Sevilla Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,6,30]]},"reference":[{"key":"e_1_2_9_2_1","first-page":"1","article-title":"Comparative Feeding Ecology of Sea Birds of a Tropical Oceanic Island","volume":"24","author":"Ashmole N. 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