City Cast Portland logo

How the South American Nutria Came to Oregon

Posted on November 10, 2022   |   Updated on September 30, 2025

Rachel Monahan

A nutria spotted in grassy Oregon field. (Getty Images/Craig Hanson/500px)

A nutria spotted in grassy Oregon field. (Getty Images/Craig Hanson/500px)

The nutria has a rat-like tail but, like beavers, lives in and around waterways. From afar, it’s a lookalike to that native species. You’re probably wondering, how did they get here? The nutria, native to South America, arrived in Oregon in the 1930s because of the fur trade. But by the 1940s, that nutria fur trade went bust; nobody wanted the furs. That meant thousands of animals were released into the Oregon wild.

They prospered and wreaked havoc on the environment and on crops.Their burrows along rivers cause erosion. They have been known to chow down on a long list of crops, including corn, beets, alfalfa, wheat, barley, oats, and various melons, according to the Oregon Department of Fish and Wildlife.

Nutria leaves the water at a Portland park. (Getty Images/John C Magee)

Nutria leaves the water at a Portland park. (Getty Images/John C Magee)

Under Oregon’s administrative rules, no one can import nutria into the state. That hasn’t helped much, though, as the state’s nutria population has thrived.

For farmers and gardeners looking to get rid of the pests, the state recommends trapping and shooting them, though shooting a nutria within city limits is forbidden for obvious reasons. Relocating the rodents is also forbidden. And watch out: state officials say they can be aggressive when trapped.

Nonetheless, among Portland's many animal lovers, they have the occasional fan.

Share article

Hey Portland

Stay connected to City Cast Portland and get ready to join the local conversation.

Can't subscribe? Turn off your ad blocker and try again.

Urban Almanac

See All
Urban AlmanacMarch 3

3 Oregon Wildflowers To Check Out This Spring

There are blooms all around us in spring. But here are three local wildflowers to seek out on your next adventure in nature.

white bloom with three petals
Urban AlmanacApril 7, 2025

Climate Change Poses Threat to Northwest Fish

Climate change is likely to compel all kinds of species migration that could lead to increased predation, competition and some localized...

A spawning redband trout from the Upper Klamath Basin next to the logs
Urban AlmanacMarch 20, 2025

Go Whale Watching This Coming Week in Oregon

It’s time for Oregon’s spring Whale Watch Week — Saturday, March 22 to Sunday March 30. In late March, the gray whales begin migrating up...

woman with binoculars stands at a window with a desk looking out at the ocean, with pink sky
Urban AlmanacMarch 6, 2025

What To Forage in Portland

There’s some good news for anyone curious about foraging for food (and fun) in Portland yards and wilderness areas. Almost all local weed...

green plants against the side of house, Portland, Oregon
Urban AlmanacDecember 19, 2024

Why Cross-Country Skiing Is Portland’s Best Winter Sport

If you’re looking for a way to stay active in the winter, consider cross-country skiing at one of the many great spots around Portland. I...

three people on skis
Urban AlmanacDecember 12, 2024

The Remote Destination in Oregon Where the Drive Is Worth the Final View

Summer Lake Hot Springs is one of those remote destinations where the journey is just as rewarding as the final destination.

dramatically lit dark sky with a building lit red outside with green light coming from windows
Urban AlmanacDecember 5, 2024

How and Where to Cut Your Own Christmas Tree in Portland

Oregon holds the distinction of being the top grower and exporter of Christmas trees in the country.

Two people drag a fir tree through a snowy area.
Urban AlmanacNovember 13, 2024

Here Are 11 Spots In Oregon You Must Explore This Winter

The Wallowa Mountains are a winter wonderland this time of year.

snowy rocky mountains

The latest in Portland

The Weekly Wander by City Cast PortlandMay 10

Side Quest: Inner Peace

The Vedanta Society of Portland, founded 100 years ago, is based in Mt. Tabor, but the group also oversees the Vedanta Retreat — 289 acre...

A large wooden eagle structure made in a Native American style is nestled among soaring evergreen trees at the Vedanta Retreat outside of Scappoose, Oregon.
The Weekly Wander by City Cast PortlandMay 10

Your Guide to Mt. Tabor

For a neighborhood built on and around an extinct volcano, Mt. Tabor is remarkably peaceful. You won’t catch a whiff of fire and brimston...

Looking west from Mt. Tabor, grass and yellow flowers sit in the foreground with evergreen trees and a filled reservoir beyond. Portland’s distant skyline can be seen on the horizon under an overcast sky.
Portland's BestApril 30

Your Guide to May 2026 in Portland

From Mother's Day brunches to 503 Day celebrations to the Primary Election, there's going on in Portland this month.

People on a podium having shot off confetti.
Food & DrinkApril 7

Where To Find the Best Deals for Portland Groceries

For the last year, Stumptown Savings’ Bryan M. Vance has been tracking where to find the cheap groceries in Portland. His one-person medi...

A grocery store aisle.
Portland's BestApril 1

Your Guide to April 2026 in Portland

Out on the Oregon Coast, April means it’s time to celebrate the puffin’s seasonal return to Cannon Beach, which will host an annual Puffi...

A closeup of a tufted puffin.
Portland's BestMarch 16

Where to Find Downtown Portland's Best Hotel Bars

With the opening of Damian Lillard's shiny new bar at the Benson Hotel, I've been thinking a lot about our city's hotel bar scene. For me...

people sitting curved banquettes and tables, at Abigail Hall, Portland, Oregon
Portland, ExplainedMarch 12

How Well Do You Know Portland?

You can tell whether you’re a real Portland resident by how you pronounce local names. Or can you? Today’s quiz tests your Portland stree...

couch street sign
Portland, ExplainedMarch 10

The Portland Area’s Local Income Taxes, Explained

Here’s a reminder on all our local taxes due today: The Portland Arts Tax, Metro Supportive Housing Services, and Multnomah County Presch...

Cropped shot of Asian woman sitting at dining table, handling personal finance with laptop.