Round-tailed Muskrat

Neofiber alleni

Also known as: Florida Water Rat

LCLeast Concern

Round-tailed muskrats are compact Florida wetland rodents that build dome-shaped lodges from grasses. Despite their name, they aren't close copies of the larger, broad-ranging muskrat. Their natural range lies in Florida and nearby southeastern Georgia. The records below trace a marsh specialist, while gaps may reflect wetland access and reporting rather than actual absence.

US Range
Explore by state

Round-tailed Muskrat across 2 states

Occurrence records, conservation status, and the places it turns up, state by state. Open a state for detail, or visit its full page.

  • FloridaNativeOccasional1,600 records

    State rankImperiled

    Notable placesIchetucknee Springs State Park · Paynes Prairie Preserve State Park · Everglades and Francis S. Taylor Wildlife Management Area · Marjorie Harris Carr Cross Florida Greenway State Recreation and Conservation Area

    Countiesrecorded in 12

    Year-round in Florida, with recorded sightings peaking in February–April, with a smaller rise in August.

  • GeorgiaNativeRare29 records

    State rankImperiled

    Notable placesDixon Memorial Wildlife Management Area · Okefenokee National Wildlife Refuge.Wilderness Area

    Countiesrecorded in 9

    Year-round in Georgia, with recorded sightings peaking in July, with a smaller rise in November and March.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

SizeRound-tailed Muskrat beside a 1.8 m adult, drawn to scale
Created by potrace 1.16, written by Peter Selinger 2001-2019 Created by potrace 1.16, written by Peter Selinger 2001-2019
Body length
21–21 cm8 in–8 in
Weight
265–265 g9.3–9.3 oz

Silhouettes drawn to scale against a 1.8 m5 ft 11 in adult.

Elevation

From 200 georeferenced records, the Round-tailed Muskrat is recorded from sea levelsea level to 73 m240 ft, with half of sightings below 28 m92 ft.

Each band shows the share of georeferenced sightings that fall within it. Records cluster where people live and hike, so low, populated elevations are over-represented. Read this as observation density, not true abundance.

Observation peakFebruary22 recordsBased on a small number of dated records; the seasonal pattern may not be representative.

Seasonality from research-grade observation dates across the US (22 records, all years). Reflects when the species is recorded, not a guarantee of presence.

Best encounter

Where and when to see a Round-tailed Muskrat

Your best chance: Florida, in February.

Where
FloridaFL
When
February
Trophic relationshipsFood web What a Round-tailed Muskrat eats, and what eats it.
Eaten by3
Great Blue HeronArdea herodiasCoyoteCanis latransAmerican AlligatorAlligator mississippiensis
This speciesRound-tailed Muskrat

Grazes on plants

Eats

A sample of documented feeding relationships, filtered to species that also occur in the US. Diet and predators vary by region and season, and this is not a complete list, many animals eat, and are eaten by, more than what has been formally recorded here.

Life history

The Round-tailed Muskrat (265 g9.3 oz) is a herbivore that first breeds around 0.3 years, carries a 28-day gestation, and bears about 2.3 young per litter.

Reproduction

Gestation
28days
Litter size
2.3youngaverage
Litters / year
4.51litters
Age at first breeding
0.3years

Diet composition

Herbivore

By foraging composition: 100% plant material.

  • Plant material100%

Most active at night.

Typical values for the species, not local measurements.

Commonly confused with

Animals people sometimes mistake for the round-tailed muskrat, and how to tell them apart.

Florida’s marsh builder

The round-tailed muskrat has a thick body, small ears, and a furry tail that isn’t flattened. Its dark coat blends into wet grasses. Tail shape and its Florida setting help separate it from the familiar muskrat.

Lodges among wetland plants

It lives in shallow freshwater marshes, wet prairies, and grassy pond edges. Animals cut plants for food and pile vegetation into low shelters above wet ground. Stems, leaves, and roots provide most meals.

Nests sit inside protected lodges. Warm conditions and fresh plant growth can support a long breeding season. Adults usually move alone outside breeding and avoid open ground.

A narrow range

Natural populations occur only in Florida and adjoining Georgia. Drainage, drought, fire, and changing water depth can quickly reshape suitable habitat. Records follow accessible wetlands, but totals aren’t population counts.

Conservation follows the water

The IUCN lists the species as Least Concern. Its limited range still makes local wetland loss important. Varied water depths and connected native plant cover give animals room to move as conditions change.

Data & sources

The data and visualizations on this page draw on these open sources: