Norway rats are an introduced commensal species in Louisiana, and NatureServe’s SNA rank, not applicable, reflects that introduced species don’t receive a state conservation status. Nearly all of the state’s 443 records, 439 of them, come from GBIF rather than casual sightings, meaning trapping and survey data, not people spotting rats near buildings, drives almost everything documented here.
November alone accounts for 87 of the 443 records, roughly a fifth of the total, with a secondary April spike of 79, a pattern more likely explained by when structured surveys ran than by any real seasonal surge in rat activity, since Norway rats breed year-round.
Full species profile
