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USDA and Partners Work to Eliminate Invasive Nutria From Maryland’s Eastern Shore

Posted by Tanya Espinosa, Public Affairs Specialist, APHIS in Animals
Aug 02, 2021
Two nutria
Nutria look a lot like beaver, which are native to the United States. However, nutria have protruding orange teeth as well as thin tails and are smaller than beaver.

Word has it that legendary actress Greta Garbo could be seen wearing nutria fur coats back in the day, and nutria fur coats can still be found in vintage clothing stores around the world. Nutria, sometimes called swamp rats, were first introduced into the United States in the 1800s to be used in the fur trade. However, when the fur trade collapsed in the mid 1900’s thousands of nutria were released by ranchers who could no longer afford to feed and care for them. This invasive rodent, about half the size of a beaver, damages wetland ecosystems by eating away at their delicate vegetation. Nutria have since been found in at least 20 states.

Maryland’s eastern shore has seen thousands of acres of protective marshland impacted by their destructive feeding habits. To protect the valuable resources of Maryland’s Chesapeake Bay, The Chesapeake Bay Nutria Eradication Project (CBNEP) began in 2002 to permanently remove invasive nutria from the marshes of the Delmarva Peninsula and to protect, enhance, and restore the aquatic and river ecosystems they damaged.

Chesapeake Bay Nutria Eradication Project Team members
The Chesapeake Bay Nutria Eradication Project Team members as of May 2018.

The U.S. Fish and Wildlife Services’ (USFWS) Chesapeake Bay Field Office Coastal Program and Chesapeake Marshlands National Wildlife Refuge Complex administer the project, which is funded through the USFWS’ Partners for Fish and Wildlife and Refuge programs. The U.S. Department of Agriculture’s (USDA) Wildlife Services program performs the nutria eradication work through an interagency agreement with the USFWS. Other partners in the project include the Maryland Department of Natural Resources, Virginia Department of Game and Inland Fisheries, Delaware Division of Natural Resources and Environmental Control, and Tudor Farms. CBNEP’s work has led to the removal of nearly 14,000 nutria, almost half from private lands.

With the voluntary cooperation of both public and private landowners, the CBNEP employs multiple techniques as they work through the stages of eradication: conducting surveys to understand the extent of the population; removing the invasive rodents; verifying that that the nutria are gone; and finally, conducting long-term monitoring to prevent re-infestation. Eradication tools include ground surveys, shoreline or boat surveys, trail cameras, monitoring platforms, hair snares, and reports from the public.

Wildlife Services also looks to innovative and new ways to search for this rodent – trained detector dogs sniff out nutria scat or excrement. Since the start of this innovative program, 6 nutria dogs have been trained – the most recent one, Bradie, completed training with her instructor, Wildlife Biologist Trevor Michaels, in May.

Nutria haven’t been detected in the Delmarva Peninsula in 3 years and the program is now in the verification phase. This phase is critical as most eradication efforts fail when they end before the task is fully complete. Long term monitoring should begin by 2020.

While this is good news for Delmarva, other parts of the country have recently discovered nutria thought long eradicated. Nutria have been discovered in the wetlands, rivers, canals and other fresh water habitats in six counties in California. Wildlife Services is working closely with the state’s lead agency, the California Department of Fish and Wildlife, to respond to this emerging issue with best practices learned from our experience on Maryland’s Eastern shore.

A nutria kept with the Chesapeake Bay Nutria Eradication Project
This nutria is one of the nutria kept with the Chesapeake Bay Nutria Eradication Project. The scat collected from the captive nutria is used to train the nutria dogs to find any wild nutria that may be present.
Category/Topic: Animals

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Penny Mikeman
Oct 10, 2018

I heard a long time ago, maybe 5 years ago that nutria are being captured in Louisiana to export to Asian countries for consumption? Is this anywhere near true?

Ben Weaver
Oct 10, 2018

@Penny Mikeman - Thanks for your question regarding our Agency’s work to control the damage from nutria. Our Agency does not capture and transport nutria, or other animals, as a potential food source internationally. Nutria management may be handled at multiple levels and we cannot speak for other Agencies regarding their policies so we recommend you contact the State to determine their policies regarding nutria management.

Jacob Appleby
Dec 07, 2018

How are ya'll trying to stop them from spreading to the other wetlands?

Ben Weaver
Dec 07, 2018

@Jacob Appleby - thank you for your comment. Invasive species are detrimental to native ecosystems and native wildlife. Executive Order 13112, signed in 1999, directs Federal agencies to provide leadership in controlling invasive species and preventing their introduction and spread. Our program, Wildlife Services, provides technical assistance as well as direct management for nutria conflicts. In some states, such as Maryland, we have partnered with other Agencies to implement large scale nutria eradication programs as well as working towards developing new ways to detect and monitor nutria. You can see more about our Chesapeake Bay Nutria Eradication Project here:

While nutria is an invasive species, in some states they are protected as furbearers. Prior to any control methods being implemented, local wildlife authorities should be contacted.

If it is believed that nutria is sighted, we recommend contacting local wildlife authorities or reporting the sighting to the local Wildlife Services State office at 1-866-4USDAWS (1-866-487-3297).

Dec 13, 2018

What do you do with the nutrias you catch?

Ben Weaver
Dec 13, 2018

@emma - thanks for your question. Nutria are an invasive species, which means that they are not native to the United States and cause devastating and widespread damage to the ecosystem. Nutria are humanely euthanized using methods approved by the American Veterinary Medical Association. Please visit this story map for more on nutria’s impact to our ecosystems:

Dec 14, 2018

What do you think would happen if nutrias weren't controlled.

Apr 19, 2019

My neighbor says they saw one of these go under my deck?! What should I do???

Kameron Hernandez
Oct 23, 2019

I am writing a research proposal to help us better understand the impact of Nutria in Texas. Where could I get recent data that has been collected concerning population numbers and regions affected? Thank you in advance for your reply.

Ben Weaver
Oct 24, 2019

@Kameron Hernandez - thanks for your interest in nutria. As you know, this invasive species can be incredibly destructive to our native ecosystems. On our website, we have a page with information specific to Nutria: While there are several links that may be of interest, you may find the “Overview” page of specific interest as you will find a link that will take you to the U.S. Geological Survey page for Nutria. That agency has information that includes the states this species was first discovered as well as the most recent sightings to inform the population numbers you seek. Thank you again for your interest!

Nov 07, 2019

I love the Nutria!!!

Andy McCormick
Mar 30, 2020

I have seen Nutria in the water off my dock over the last few days. I don’t have an accurate count but would say around 6 of them. I live at Easton, MD. The body of water is know as either Snug Harbor or Hope Creek and it is off Trippe Creek, which feeds into the Tred Avon.

Let me know if there is something I should be doing.


Ben Weaver
Mar 31, 2020

@Andy McCormick - thank you for your comment. Thank you for providing this information – it will be sent to the Wildlife Services Maryland office. We also ask that you call to report it: (866) 4USDA-WS (866-487-3297) so that we can get additional information from you. As you may know, our program has worked hard to eradicate nutria from the state so we appreciate your diligence in reporting any sightings. Thank you!

Apr 27, 2020

I'm doing a project for my 6th-grade science class on the invasive species Nutria (Mycoastor Coypus). Do you have any population data you can share with me that I could graph? For example the population in the US or a specific state over time? I haven't been able to find the data year to year anywhere online. I could also graph the detrimental effects if that data is somehow more available.

Ben Weaver
Apr 28, 2020

@Ashley - thanks for your question! If you look on USDA’s Nutria webpage (, under “Overview” you will be prompted to “click” in order to view nutria distribution maps and biological information. That will take you to the U.S. Geological Service website for nutria, where their population is tracked in locations nationwide. For additional information about population numbers over time, APHIS recommends that you contact the appropriate State Departments of Agriculture, Fish and Wildlife or Natural Resources where you seek information. While we do not have the data you seek, our Flickr site has photos and information about Nutria work in Maryland that you may also find useful: and

Chloe Ward
Mar 07, 2021

I am doing an invasive species project on Nutria for my 7th grade science class. In the article it does not mention what happens to the Nutria once they are captured... Do they put them somewhere (if so, where are they put) or do they just kill them.

Ben Weaver
Mar 08, 2021

@Chloe Ward - thank you for your interest in our Nutria program. Nutria (Myocastor coypus) are large, semi-aquatic rodents that are native to South America. The species is invasive in the United States, and is now established in 17 states. Nutria cause extensive damage to wetlands, agricultural crops, and structural foundations such as dikes and roads. They may also threaten human health and safety and serve as a reservoir for tularemia and other diseases.

Because this species is not native to the United States, it would be irresponsible to relocate them to another area as they would then cause damage for the new location. Nutria are humanely euthanized to prevent the spread and protect U.S. resources.

Veronica Williams
Mar 05, 2022

There was one located at the isles of Capri in bettendorf Iowa

Thomas Boarman
May 29, 2022

Believe we have nutria in the Wye river,eastern shore Maryland May 2022,caught one on camera on a small floating island made of bamboo on our shoreline.