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We conducted repeated open\u2010field tests of exploration in a common forest rodent, the yellow\u2010necked mouse <jats:italic>Apodemus flavicollis<\/jats:italic>. Contrary to expectations, the exploration did not vary with the season (spring vs. fall) or the reproductive status of the tested animals. Also unexpectedly, there was an inverted U\u2010shaped relationship between body mass and exploration: animals with intermediate body mass tended to have the highest exploration tendencies. Males were more exploratory than females. Finally, even after adjusting for the effects of body mass and sex, individuals exhibited consistent, repeatable differences in exploration tendencies (\u201cbehavioral types\u201d or \u201cpersonalities\u201d). The discrepancies between certain broad generalizations and our results suggest that risk taking depends on details of species\u2010specific biology.<\/jats:p>","DOI":"10.1002\/ece3.8771","type":"journal-article","created":{"date-parts":[[2022,3,28]],"date-time":"2022-03-28T05:52:54Z","timestamp":1648446774000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Body mass and sex, but not breeding condition and season, influence open\u2010field exploration in the yellow\u2010necked mouse"],"prefix":"10.1002","volume":"12","author":[{"given":"Paula A.","family":"Bednarz","sequence":"first","affiliation":[{"name":"Department of Systematic Zoology Adam Mickiewicz University in Pozna\u0144  Pozna\u0144 Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7665-5033","authenticated-orcid":false,"given":"Rafa\u0142","family":"Zwolak","sequence":"additional","affiliation":[{"name":"Department of Systematic Zoology Adam Mickiewicz University in Pozna\u0144  Pozna\u0144 Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,3,27]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.evolhumbehav.2017.01.003"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0003\u20103472(73)80065\u2010X"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/brv.12507"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anbehav.2008.12.022"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anbehav.2020.02.013"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/jeb.12081"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anbehav.2016.10.017"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/1365\u20102745.13307"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.32614\/RJ\u20102017\u2010066"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7998.2006.00107.x"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/brv.12007"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1093\/beheco\/5.2.159"},{"key":"e_1_2_10_14_1","volume-title":"An introduction to behavioural ecology","author":"Davies N. 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