Beaver reports concentrate at Lake Tahoe, with smaller clusters at Tahoe, Inyo, and San Bernardino national forests, Yosemite, and a handful of other Sierra and Southern California sites, the lakes and slow streams this dam-building rodent needs to flood a pond deep enough to protect its lodge entrance.
Whether beavers actually belong across this range has a genuinely contested history. California’s state fields flag the species as invasive, and federal USGS NAS records confirm just 2 nonindigenous occurrences with an established population, a tiny fraction of the 2,751 total records logged here. Historical ecologists have argued beavers were native to far more of California, including parts of the Sierra Nevada, than wildlife agencies once assumed, so a single statewide origin label doesn’t fully capture the picture.
Records run close to flat across all twelve months, without a real seasonal spike. Beavers stay active year-round maintaining dams and lodges, so a lack of any strong peak likely reflects the animal’s own steady habits as much as steady observer effort at popular sites like Tahoe.
Full species profile
