Return of the Swamp Rabbit: <i>Sylvilagus aquaticus</i> Occupancy Increased and Expanded Along the Northern Extent of Its Distribution Range

ABSTRACT Swamp rabbits ( Sylvilagus aquaticus ) are a bottomland hardwood specialist that have experienced range contraction at the northern and western extents of their range. While swamp rabbit distribution has been studied at the northern periphery of its range, drivers of change over time have not been investigated. Here, we analyzed data collected in 2010–2012 and 2022–2023 across 16 counties in southeastern Missouri, USA and reported environmental factors driving changes in occupancy states. Occupancy probability increased between decadal surveys (0.66–0.79). Occupancy probability was negatively influenced by site isolation and patch richness density but positively influenced by site area. Colonization and extinction probabilities were influenced by bottomland hardwood forest cover change and flooding effects. When ground latrines were included, we observed an increase in detection (0.68–0.84) and occupancy probabilities (0.95–1.00). Swamp rabbit populations appear to have expanded within southeastern Missouri following many decades of range contraction.