Why are giant nutria a threat to California?

Nutrias consume large amounts of vegetation, burrow destructively, and ravage waterways and ecosystems, posing a threat to the state's agriculture and water supply.

Where did the nutria in California likely come from?

Recent studies suggest that the nutria populations in California were intentionally transported from Oregon, as they share a close genetic match.

How is California trying to control the nutria population?

Since 2017, the Department of Fish and Wildlife has removed over 7,800 nutria through trapping and by releasing sterilized nutria with tracking devices.

Home / Environment / Giant Rodent Invaders: Oregon Origin Theory

Giant Rodent Invaders: Oregon Origin Theory

12 Apr

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Summary

Giant destructive rodents reappeared in California after nearly four decades.
Genetic evidence suggests nutria were intentionally transported from Oregon.
Nutrias threaten California's ecosystems, agriculture, and water supply.

Giant Rodent Invaders: Oregon Origin Theory

State wildlife officials have developed a theory regarding the origin of the giant, destructive nutria that have recently resurfaced in California. These rodents, resembling a small beaver with platypus-like feet and a rat's tail, were considered eradicated from the state nearly four decades ago.

A study released by the California Department of Fish and Wildlife indicates that the nutria populations currently in California are genetically similar to those found in Oregon. Researchers believe this close match suggests the animals were likely transported intentionally, as natural migration over such a distance is highly improbable.