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  • The dataset details the biological characteristics and concentrations of toxic metals/semi-metals in liver tissue from 278 Eurasian otters (Lutra lutra) that died across England and Wales during the period 2006-2017. For each otter carcass, location (National Grid Reference) was recorded. These locations were used to collate data describing spatial variation in stream and soil biochemistry, weather, and potential anthropogenic sources of contaminants in the otter's habitat from a range of sources. This data was collected as part of the Cardiff University Otter Project. This project was supported in part by a grant from the Esme Fairbairn Foundation. The CEH contribution was supported the Natural Environment Research Council award number NE/R016429/1 as part of the UK-SCaPE programme delivering National Capability. This study contains model estimates of topsoil properties [Countryside Survey] and British Geological Survey data owned by © NERC as well as Ordnance Survey data owned by © Crown copyright and database right 2007. Full details about this dataset can be found at