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Giant Rodent Invaders: Oregon Origin Theory
12 Apr
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.
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.
Native to South America, nutria were initially introduced to the U.S. for a failed fur trade. They were largely absent until 2017, when a pregnant female was discovered in Merced County. Nutria thrive in mild winters, reproducing rapidly and consuming up to a quarter of their body weight in vegetation daily. They are now prevalent in the Central Valley's marshes, particularly around the Sacramento-San Joaquin Delta.
These invasive rodents pose significant threats to California's agriculture and water systems due to their destructive burrowing habits and voracious appetite for vegetation. Since 2017, authorities have removed over 7,800 nutria through trapping and sterilization programs. The U.S. Fish and Wildlife Service has even suggested hunting and consuming nutria as a control method.
