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Yet, understanding foraging behavior and diet of large herbivores is challenging in the subarctic because of their remote ranges. We used GPS video\u2010camera collars to observe behaviors and summer diets of the migratory Fortymile Caribou Herd (\n                    <jats:italic>Rangifer tarandus granti<\/jats:italic>\n                    ) across Alaska, USA and the Yukon, Canada. First, we characterized caribou behavior. Second, we tested if videos could be used to quantify changes in the probability of eating events. Third, we estimated summer diets at the finest taxonomic resolution possible through videos. Finally, we compared summer diet estimates from video collars to microhistological analysis of fecal pellets. We classified 18,134 videos from 30 female caribou over two summers (2018 and 2019). Caribou behaviors included eating (mean\u00a0=\u00a043.5%), ruminating (25.6%), travelling (14.0%), stationary awake (11.3%) and napping (5.1%). Eating was restricted by insect harassment. We classified forage(s) consumed in 5,549 videos where diet composition (monthly) highlighted a strong tradeoff between lichens and shrubs; shrubs dominated diets in June and July when lichen use declined. We identified 63\u00a0species, 70\u00a0genus and 33 family groups of summer forages from videos. After adjusting for digestibility, monthly estimates of diet composition were strongly correlated at the scale of the forage functional type (i.e., forage groups composed of forbs, graminoids, mosses, shrubs and lichens;\n                    <jats:italic>r\u00a0<\/jats:italic>\n                    =\u00a00.79,\n                    <jats:italic>p<\/jats:italic>\n                    \u00a0&lt;\u00a0.01). Using video collars, we identified (1) a pronounced tradeoff in summer foraging between lichens and shrubs and (2) the costs of insect harassment on eating. Understanding caribou foraging ecology is needed to plan for their long\u2010term conservation across the circumpolar north, and video collars can provide a powerful approach across remote regions.\n                  <\/jats:p>","DOI":"10.1002\/ece3.8349","type":"journal-article","created":{"date-parts":[[2021,12,6]],"date-time":"2021-12-06T04:26:13Z","timestamp":1638764773000},"page":"17835-17872","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Critical summer foraging tradeoffs in a subarctic ungulate"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7759-2460","authenticated-orcid":false,"given":"Libby","family":"Ehlers","sequence":"first","affiliation":[{"name":"Wildlife Biology Program Department of Ecosystem and Conservation Sciences University of Montana Missoula Montana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabrielle","family":"Coulombe","sequence":"additional","affiliation":[{"name":"Wildlife Biology Program Department of Ecosystem and Conservation Sciences University of Montana Missoula Montana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jim","family":"Herriges","sequence":"additional","affiliation":[{"name":"Bureau of Land Management Fairbanks Alaska USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Torsten","family":"Bentzen","sequence":"additional","affiliation":[{"name":"Alaska Department of Fish and Game Fairbanks Alaska USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7463-8320","authenticated-orcid":false,"given":"Michael","family":"Suitor","sequence":"additional","affiliation":[{"name":"Yukon Government Dawson City Yukon Territory Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8420-7452","authenticated-orcid":false,"given":"Kyle","family":"Joly","sequence":"additional","affiliation":[{"name":"National Park Service Yukon\u2010Charley Rivers National Preserve Fairbanks Alaska USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5382-1361","authenticated-orcid":false,"given":"Mark","family":"Hebblewhite","sequence":"additional","affiliation":[{"name":"Wildlife Biology Program Department of Ecosystem and Conservation Sciences University of Montana Missoula Montana USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,12,6]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1080\/14794802.2011.585831"},{"issue":"2","key":"e_1_2_9_3_1","doi-asserted-by":"crossref","first-page":"274","DOI":"10.5962\/p.363788","article-title":"Use of host\u2010mimicking trap catches to determine which parasitic flies attack Reindeer, Rangifer tarandus, under different climatic conditions","volume":"115","author":"Anderson J. 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