White-footed mice turn up across a wide slice of Delaware, from the wooded creek banks of White Clay Creek State Park in the Piedmont to the tidal marsh edges of Bombay Hook and Prime Hook National Wildlife Refuges on the Coastal Plain. Wherever there’s a line of brush, a stone wall, or a stand of trees next to open ground, records tend to follow.
Brown back, white feet, a quicker climber than it looks
This mouse earns its name plainly, with a warm brown back, a white belly, and white feet that stand out against darker soil or bark. Its eyes are large and dark, built for moving around after dark, and it climbs stems, vines, and low branches more readily than a house mouse ever would. That habit lets it disappear upward into cover the instant something disturbs it, rather than scrambling across open ground.
The state’s main Lyme disease reservoir
Beyond its own natural history, this mouse carries real weight in Delaware’s tick ecology. It’s the primary host that young blacklegged ticks pick up Lyme disease bacteria from before they ever bite a person, and Delaware is regularly among the states with the highest Lyme disease rates per capita, especially in the wooded Piedmont up north. The mouse itself isn’t a health risk. It’s simply the first link in a longer chain that runs from mouse to tick to whatever the tick bites next.
Status in Delaware
NatureServe ranks the white-footed mouse S5, secure, and it’s native throughout the state. It’s one of the more frequently recorded small mammals here, showing up in records from both the state’s wooded north and its marshy south.
Full species profile
