Resistance to anticoagulants in rats and mice has the potential to affect exposure and poisoning risk in predatory birds and mammals that eat rodents.
The latest information on where resistance to anticoagulants has been found is described in a report published on the Campaign for Responsible Rodenticide Use website https://www.thinkwildlife.org/downloads/
The full citation for the report is: Jones, C., Talavera, M., Buckle, A. and Prescott. C., 2019. Anticoagulant resistance in rats and mice in the UK – summary report with new data for 2019. Vertebrate Pests Unit, The University of Reading, Report No. VPU/19/12. 17 pp. https://www.thinkwildlife.org/download/crru-2019-resistance-report-final/?wpdmdl=17815