The Norway rat isn’t a native part of Alaska’s wildlife, and the record here reflects that directly: reports cluster in the Aleutian Islands and around the ports and docks of Prince William Sound and Glacier Bay, wherever ships have called for generations. Norway rats reached the Aleutians the same way they reached ports worldwide, as stowaways on vessels, and a few islands there were once nicknamed the Rat Islands after rats from an 18th-century shipwreck overran them.
Everything about how this rat lives here matches how it lives anywhere else it’s spread: it digs burrows along waterfronts, docks, and building foundations rather than living wild in the surrounding tundra or forest. It eats whatever a port or fishing town offers, from spilled grain and bait to garbage and carrion, and it dens in the same kind of ground-level cover, walls, or pilings it would use in any harbor town on the Pacific coast.
Alaska’s harbor towns and remote islands are also where wildlife agencies have carried out some of the most determined rat-removal work anywhere in the country. Several Aleutian islands, overrun after historic shipwrecks, have had their rat populations eliminated entirely to protect nesting seabird colonies that never evolved defenses against a ground predator like this one.
Reports here run year-round with scattered peaks in January, June, September, and November, a pattern more tied to when people happen to be checking traps and docks than to any real seasonal rhythm in the rat’s own life. A record in this dataset marks a report at a port or settlement, not a wild population spread across the state.
Full species profile
