The Western Harvest Mouse is a tiny, big-eared mouse recognized by the distinctive groove down the front of each upper incisor, unique among American mice. It builds spherical grass nests above the ground among dense vegetation, using them for sleeping and raising young. Its grooved incisors are an adaptation for stripping grass seeds efficiently.
Best time to see a Western Harvest Mouse
The best time to see a Western Harvest Mouse is February–August, when about 61% of U.S. sightings happen, based on 415 research-grade iNaturalist observations.
Not certain it is a Western Harvest Mouse? What animal is this? walks through what to check first and the lookalikes that catch people out.
Recent Western Harvest Mouse sightings near you
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