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However, measuring wildlife exposure to contaminants can be challenging due to accessibility of species and\/or sampling tissue matrices needed to assess wildlife health risks. For example, in bats and other taxa that use roosts, collecting feces under colonies minimizes disturbance to species of conservation concern, but fecal contaminant concentrations may not directly correlate with tissue contaminant concentrations. Thus, there is a need for quantifying contaminant exposure relationships between sample matrices for initial risk assessments to address wildlife health and conservation needs. Our goal was to assess the relationship between fecal and fur total mercury (THg) concentrations. We collected paired feces and fur samples (<jats:italic>n<\/jats:italic>\u2009=\u200948) from Mexican free-tailed bats (<jats:italic>Tadarida brasiliensis<\/jats:italic>) in summer 2023 in western Oklahoma at a maternity roost. At the individual level, we found no correlation between fecal and fur THg. However, at the population level, fur THg concentrations were on average 6.06-times greater than fecal THg concentrations. We conclude that although fecal THg cannot serve as a proxy of individual bat fur THg, population-level differences could be used cautiously to estimate mean fur THg concentrations from under-roost feces and motivate individual-level sampling to assess health impacts. We encourage continued research across other insectivorous bat species and sites for determining THg relationships across tissues and initial risk assessments with minimal disturbance to species of conservation concern when a contaminant point source is not yet known.<\/jats:p>","DOI":"10.1007\/s10646-025-02928-2","type":"journal-article","created":{"date-parts":[[2025,7,2]],"date-time":"2025-07-02T02:57:23Z","timestamp":1751425043000},"page":"1637-1644","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A paired analysis of mercury among non-invasive tissues in Mexican free-tailed bats (Tadarida brasiliensis) to inform conservation monitoring"],"prefix":"10.1007","volume":"34","author":[{"given":"Molly C.","family":"Simonis","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kimberlee","family":"Whitmore","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kristin E.","family":"Dyer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meagan","family":"Allira","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bret","family":"Demory","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matthew M.","family":"Chumchal","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel J.","family":"Becker","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,7,2]]},"reference":[{"key":"2928_CR1","first-page":"S49","volume":"29","author":"DA Armbruster","year":"2008","unstructured":"Armbruster DA, Pry T (2008) Limit of blank, limit of detection and limit of quantitation. 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