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Because red blood cells are made from materials that can be limiting, however, it is thought that hematocrit may also reflect general body condition and access to resources. We tested the effect of hydration state, resource restriction (i.e., time available to forage), and activity (i.e., different cage sizes) on hematocrit in captive red crossbills (<jats:italic>Loxia curvirostra<\/jats:italic>). We found no evidence that a mild dehydration protocol impacts hematocrit and only weak support that mild food restriction impacts hematocrit. Food restriction did, however, reduce fat deposits and fat loss was more significant in birds that were also sampled for hematocrit. Furthermore, food\u2010restricted birds housed in flight aviaries recovered hematocrit but not fat stores following repeated blood sampling, whereas birds housed in small cages lost additional hematocrit but mitigated fat loss following successive bleeds. Together these results suggest that different flight demands may determine response to blood loss during food restriction, potentially revealing a trade\u2010off between fat storage and red blood cell development. Our results also demonstrate the need for scientists to carefully record hematocrit data and the time course across which multiple tubes of blood are collected to avoid confounding real patterns with variation generated by sampling protocol.<\/jats:p>","DOI":"10.1002\/jez.2417","type":"journal-article","created":{"date-parts":[[2020,10,7]],"date-time":"2020-10-07T17:58:39Z","timestamp":1602093519000},"page":"670-680","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Recovery of hematocrit and fat deposits varies by cage size in food\u2010restricted captive red crossbills (<i>Loxia curvirostra<\/i>)"],"prefix":"10.1002","volume":"333","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8597-6739","authenticated-orcid":false,"given":"Dawson C.","family":"Bradley","sequence":"first","affiliation":[{"name":"Department of Biology Eastern Michigan University  Ypsilanti Michigan USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megan","family":"Wurtz","sequence":"additional","affiliation":[{"name":"Department of Biology Eastern Michigan University  Ypsilanti Michigan USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jamie M.","family":"Cornelius","sequence":"additional","affiliation":[{"name":"Department of Integrative Biology Oregon State University  Corvallis Oregon USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,10,7]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1474-919X.2002.t01-2-00094_1.x"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.beproc.2017.08.013"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpregu.1989.257.4.R732"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1080\/03079459208418837"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1461-0248.1999.00088.x"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.2307\/2390009"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1525\/cond.2010.090113"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1890\/14-0418.1"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1086\/603635"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.193227"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4613-0425-8"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1086\/physzool.66.5.30163826"},{"issue":"1","key":"e_1_2_8_14_1","first-page":"169","article-title":"Some blood characteristics of white\u2010crowned sparrows during molt","volume":"94","author":"Chilgren J. 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