In little brown bats, post‐WNS populations have higher fat mass (Cheng et al. 2019) and multiple loci found to be under selection due to WNS are in or near genes related to glucose cycling, insulin, or diabetes (Auteri and Knowles 2020; Gignoux‐Wolfsohn et al. 2021; Lilley et al. 2020). This evidence concerns the gene INS and diabetes mellitus.