Cottontail vs. Swamp & Marsh Rabbit

You’re hunting a wide creek-bottom with your beagle, and a big rabbit kicks out of a tangle of willows. You line up the shot — then pause. It looked larger than usual, and the tail seemed different. Was that a cottontail, or did you just see a swamp rabbit? They’re different species, and depending on where you stand in the state, both are possible.

Quick recall

Quick recall — which one cottontail field mark is most visible when a rabbit flushes and runs?

Quick recall — which one cottontail field mark is most visible when a rabbit flushes and runs?

The white cotton-ball tail, flashing on every bound The rusty nape The white forehead blaze

Check answer

Three rabbits, one state

South Carolina is home to three native rabbit species. Knowing which one you’re looking at matters for both identification and legal hunting purposes.

	Eastern Cottontail	Swamp Rabbit	Marsh Rabbit
Weight	2–4 lbs	4–5+ lbs	2–3 lbs
Length	15–20 in	18–22 in	14–17 in
Tail underside	Bright white	Grayish-white	Dark bluish-gray (“bluetail”)
Eye ring	None prominent	Cinnamon-colored ring	Dark spot/ring
Coat	Grizzled brown-gray, rusty nape	Coarser, darker brown-black mix	Reddish-brown, darker belly
Primary habitat	Upland brushy fields, old fields	Bottomland swamps, floodplains	Coastal marshes, tidal wetlands
SC range	Statewide	Western Piedmont and below	Coast and lower coastal plain

The swamp rabbit — bigger and wetter

The swamp rabbit (Sylvilagus aquaticus) is the largest rabbit in the eastern US. Where a cottontail tops out around 4 lbs, a mature swamp rabbit can push 5 lbs or more and measure up to 22 inches. In South Carolina, it inhabits bottomland hardwood swamps, floodplains, and wetland drainages — and its range reaches the western Piedmont where river bottomlands persist.

The key marks:

1. Size. Hold your hands out — a swamp rabbit is noticeably heavier and longer than a cottontail. If the rabbit looks “big” in the field, that’s data.
2. Cinnamon eye ring. The most diagnostic mark when you have a still look: a warm cinnamon or rust-colored circle surrounding the eye. Eastern cottontails lack this ring.
3. Tail. The swamp rabbit’s tail underside is grayish-white, not the bright clean white of the cottontail. The difference is subtle in poor light; pair it with size and habitat.
4. Coat. Coarser, darker, with more black and rusty-brown mixed in — less of the cottontail’s smooth grizzle.

Habitat is your fastest filter: if you’re hunting upland briar patches and old fields far from a major creek or swamp, you’re almost certainly looking at a cottontail. If you’re hunting a river-bottom hardwood swamp, consider the swamp rabbit seriously.

The why Can swamp rabbits swim? Yes — and that matters.

Swamp rabbits are capable and willing swimmers — they will readily enter water to escape predators or simply to cross a slough. A rabbit that jumps in the water and swims is almost certainly a swamp rabbit. Cottontails can swim in a pinch but strongly avoid it. This behavior difference can clinch an uncertain ID in bottomland habitat.

The marsh rabbit — the coastal species

The marsh rabbit (Sylvilagus palustris) is a semi-aquatic species tied to coastal freshwater and brackish marshes, estuaries, and wetland edges. In the Piedmont, you will essentially never encounter one — it’s a coastal-plain animal.

The key marks:

1. Dark “bluetail.” The underside of the marsh rabbit’s tail is dark bluish-gray — so different from the cottontail’s white bob that some hunters call it the “bluetail.” If the tail flashes dark gray-blue instead of white, you’re looking at a marsh rabbit.
2. Overall reddish-brown. The coat tends toward rusty-brown with a darker belly (the cottontail’s belly is white).
3. Smaller ears, shorter legs. Relative to the cottontail, the marsh rabbit looks more compact and stumpy.
4. Habitat. Tied to water: tidal marsh, sawgrass, cattail edges. Never in upland old fields.

Read the habitat, then confirm the marks

The diagram below shows how habitat zones map to species. Use habitat as your first filter; use the physical marks to confirm.

White tail — bright white underside Cinnamon eye ring — warm rust circle around eye Dark bluetail — bluish-gray, never white

Tell the species apart

These questions mix habitats and marks. Answer each independently.

Knowledge check

You jump a rabbit from a tangle of blackberry briars in an old field on a Piedmont hillside. The tail flashes bright white as it runs. Most likely species?

You jump a rabbit from a tangle of blackberry briars in an old field on a Piedmont hillside. The tail flashes bright white as it runs. Most likely species?

Eastern cottontail — habitat and tail color both match Swamp rabbit — they also live in upland areas Marsh rabbit — similar size to a cottontail

Check answer

Knowledge check

You're hunting a river-bottom swamp in Newberry County and flush a large rabbit. You get a still look: it has a warm cinnamon-colored ring clearly visible around each eye. What are you looking at?

You're hunting a river-bottom swamp in Newberry County and flush a large rabbit. You get a still look: it has a warm cinnamon-colored ring clearly visible around each eye. What are you looking at?

Swamp rabbit — cinnamon eye ring is the diagnostic mark, and the habitat matches Eastern cottontail — they have an eye ring too Marsh rabbit — the rings look similar

Check answer

Knowledge check

A hunter near the coast sees a medium-sized reddish-brown rabbit flush from a tidal marsh edge. The tail flashes — dark bluish-gray, not white. What species is this?

A hunter near the coast sees a medium-sized reddish-brown rabbit flush from a tidal marsh edge. The tail flashes — dark bluish-gray, not white. What species is this?

Marsh rabbit — dark bluetail and tidal-marsh habitat are the giveaway Eastern cottontail — common in all SC habitats Swamp rabbit — it could have swum out there

Check answer

Take it to the woods

The best preparation for a field ID is knowing your region’s range overlap.

Pre-season habitat mapping exercise

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Reset

• Look up your primary hunting county on a SC map. Is it western Piedmont (swamp rabbit possible in bottomlands) or eastern/coastal plain (marsh rabbit possible near the coast)?
• Identify the cover type you'll hunt: upland old field/cutover = almost certainly cottontail; river-bottom swamp = check for swamp rabbit.
• Review photos of swamp rabbit cinnamon eye ring and marsh rabbit dark tail online so you have a mental image before the field.
• Check iNaturalist for observations of Sylvilagus aquaticus and Sylvilagus palustris near your hunting area to know if overlap is realistic.

Sources

• SCDNR SWAP — Swamp Rabbit Sylvilagus aquaticus (2015): https://www.dnr.sc.gov/swap/supplemental/mammals/swamprabbit2015.pdf
• Animal Diversity Web, Sylvilagus aquaticus: https://animaldiversity.org/accounts/Sylvilagus_aquaticus/
• Animal Diversity Web, Sylvilagus palustris: https://animaldiversity.org/accounts/Sylvilagus_palustris/
• NC Wildlife, Marsh Rabbit profile: https://www.ncwildlife.gov/species/marsh-rabbit
• National Wildlife Federation, Swamp Rabbit: https://www.nwf.org/Educational-Resources/Wildlife-Guide/Mammals/Swamp-Rabbit
• SCDNR SWAP — Appalachian Cottontail Sylvilagus obscurus (for range context): https://www.dnr.sc.gov/swap/supplemental/mammals/appalachiancottontail2015.pdf