With 9847 records, the white-tailed deer is the second most documented species in Illinois’s mammal atlas, and its map covers all 102 counties, from Cook County’s forest preserves to Shawnee National Forest in the far south. That reach is remarkable for an animal that was nearly gone from Illinois a century ago, when unregulated hunting and clearing had reduced it to a remnant.
An edge animal in a farm state
White-tailed deer are browsers built for boundaries. They feed on twigs, leaves, acorns, and green growth where cover meets open ground, and Illinois’s patchwork of woodlot, fencerow, river bottom, and cropland is edge habitat on a vast scale. Records run from the restored tallgrass of Midewin and Goose Lake Prairie State Natural Area to the wetlands of Chautauqua National Wildlife Refuge and the Cache River bottomlands, and they are thick through the suburban fringe, where deer have learned to live among lawns and garden beds.
Spring green-up and hidden fawns
Reports climb to their peak in April and May, when deer are out feeding hard on new growth after the lean months. Fawning follows close behind, most fawns arriving in late May and June, and for their first weeks a spotted fawn lies motionless in grass or cover while its mother feeds apart from it, returning only to nurse. By fall the family groups are moving widely again, and the November rut puts bucks on the landscape at all hours.
Status in Illinois
NatureServe ranks the white-tailed deer S5, Secure, in Illinois, and the species is native to the state. USGS NAS does not list it as nonindigenous here.
Full species profile
