House mouse is not native to Wyoming or North America, carried worldwide by human commerce, and NatureServe flags it as exotic with no state conservation rank assigned. Its 139 Wyoming records, all from GBIF with zero iNaturalist entries, cluster around the National Elk Refuge, Seedskadee National Wildlife Refuge, and the Yellowstone River corridor, likely reflecting rodent-trapping survey data near buildings and agricultural structures rather than wild colonization.
Records spike at 42 in September and rise again in winter months, a pattern that likely tracks mice moving indoors as temperatures drop rather than a true summer breeding peak, since house mice breed year-round wherever shelter and food are available.
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