The Carolina Wren is the small, cinnamon-brown bird with a bold white eyebrow and a cocked tail that belts out teakettle-teakettle from thickets, brush piles and backyard tangles across the eastern US. It is shy and often hard to see, but surprisingly loud for its size (Cornell). Pairs stay together all year, so a yard with the right cover can hold wrens in every month.
Quick facts
| Fact | Carolina Wren |
|---|---|
| Scientific name | Thryothorus ludovicianus, family Troglodytidae, the wrens (Cornell) |
| Length | 4.7–5.5 in, 12–14 cm (Cornell); 5½ in (Audubon) |
| Weight | 0.6–0.8 oz, 18–22 g (Cornell) |
| Wingspan | 11.4 in, 29 cm (Cornell) |
| Population | Global breeding population of about 19 million (Cornell; Audubon lists the same figure) |
| Trend | Increased from 1966 to 2019 (North American Breeding Bird Survey, via Cornell); probably stable and possibly expanding (Audubon) |
| Status | Low Concern, Partners in Flight score 7 of 20 (Cornell); Least Concern (IUCN, via Audubon) |
| Oldest known | At least 7 years 8 months: banded in Florida in 1997, recaptured and released there in 2004 (Cornell) |
How to identify a Carolina Wren
Cornell describes a small but chunky bird with a round body, a large head with very little neck, a long, slender, downcurved bill and a long tail it often cocks upward. It is slightly smaller than a sparrow and slightly larger than a House Wren.
- Color: bright, unpatterned reddish-brown above and warm buffy-orange below, with a long white eyebrow stripe, a white chin and throat, and a dark bill (Cornell). Audubon notes it is brighter than most other wrens.
- Males and females look alike (Cornell).
- Tail: cocked up while foraging, held down while singing (Cornell).
- Behavior: creeps through vegetation and up and down tree trunks; pokes into yards, garages and woodpiles; scolds and chases intruders (Cornell). It is a weak flyer that makes short, quick flights (Cornell).
- Regional differences: Florida birds are larger and stouter, with darker rusty-chestnut upperparts and deeper-colored underparts (Cornell).
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Photos: Rhododendrites / CC BY-SA 4.0, via Wikimedia Commons; Rhododendrites / CC BY-SA 4.0, via Wikimedia Commons
Carolina vs House vs Bewick's Wren
Cornell lists two similar species, the Northern House Wren (Cornell's current name for the House Wren) and Bewick's Wren.
| Field mark | Carolina Wren | Northern House Wren | Bewick's Wren |
|---|---|---|---|
| Length (Cornell) | 4.7–5.5 in | 4.3–5.1 in | 5.1 in |
| Weight (Cornell) | 0.6–0.8 oz | 0.3–0.4 oz | 0.3–0.4 oz |
| Eyebrow | Long, white, bold | Much fainter than on most wrens | Long, white |
| Upperparts | Bright reddish-brown, unpatterned | Subdued brown, darker bars on wings and tail | Plain brown, subdued brown and gray |
| Underparts | Warm buffy-orange, white throat | Subdued brown overall, paler throat | Grayish-white |
| Tail | Long, cocked; no white corners (Audubon) | Cocked up or slightly drooped | Strikingly long, barred black, tipped with white spots; often flicked or fanned |
| Range notes | Eastern US; pairs hold territories year-round | "Northern" group across nearly all of its US and Canadian range | Fairly common in much of the West; has "virtually disappeared from the East" |
Facts in the House and Bewick's columns are from Cornell's identification pages for those species.
- Carolina Wren: long, bold white eyebrow; bright reddish-brown above; warm buffy-orange below with a white throat; no white tail corners.
- Northern House Wren: eyebrow much fainter; subdued brown overall with darker barring on wings and tail; slightly smaller than a Carolina Wren.
- Bewick's Wren: long white eyebrow; plain brown back; grayish-white underparts; long tail barred black and tipped with white spots.
Song and calls
- Song: a series of quick, whistled, three-parted notes repeated a few times, usually lasting under 2 seconds, often written teakettle or germany (Cornell). Only males sing it (Cornell).
- Repertoire: each male has up to several dozen song variations and repeats one about 15 times before switching (Cornell). One captive male sang nearly 3,000 times in a single day (Cornell).
- All year: Audubon describes loud, whistled, repeated phrases sung throughout the year, all day long, and pairs that often duet in any season, the female giving a chattering note while the male sings.
- Calls: loud, repeated rasping and chattering, and a rising and falling cheer (Cornell).
To find one, Cornell suggests listening for the male's loud, piercing song from woody or thickly vegetated areas. If your Bird-a-Day house rules count heard birds, a wren you only hear still makes the day.
Range and winter
Audubon calls the Carolina Wren a permanent resident that may wander north of its breeding range, especially in fall. It is sensitive to cold: northern populations drop sharply after severe winters, and icy, snowy winters can sharply reduce local numbers, though they recover quickly (Cornell). Audubon describes the northern edge expanding north in runs of mild years and retreating south after harsh winters.
Over the past century, warmer average winters have coincided with a northward spread (Cornell). A 2015 Cornell article drew on Project FeederWatch data to document it: Carolina Wrens had recently wintered as far north as Minneapolis, Milwaukee and Montreal; in Massachusetts they were reported at 73% of bird feeders in the most recent winter, up from 58% in 2003–04; and in Michigan 26% of FeederWatchers reported them, up from 8% about ten years earlier. Cornell adds that backyard feeders have helped the species, especially in the north, where snow and ice can bury natural food.
Food and feeders
| Topic | What the sources say |
|---|---|
| Diet | Mostly insects and spiders, such as caterpillars, moths, beetles, crickets and cockroaches; occasionally lizards, frogs or snakes, and a little fruit pulp and seed (Cornell). Audubon adds berries and small fruits, especially in winter |
| Feeder foods | Suet, especially in winter (Cornell); suet, peanuts and other foods (Audubon). See our suet guide for hot-weather rules |
| Where it forages | On or near the ground, through leaf litter, tangles and gaps under fallen trees, logs and stumps (Cornell) |
| Cover | A brush pile in the yard encourages wrens to settle in (Cornell); they favor tangles of vines and bushes (Cornell) |
More on matching foods to feeders: bird feeder types compared.
Nesting
Males build several starter nests; the female picks one and the pair finishes it together (Cornell). The nest is a bulky, domed cup with a side entrance, often with a woven, porch-like extension, made of bark, grasses, leaves, feathers and string (Cornell). Audubon adds that a piece of snakeskin is often included. Near homes, wrens nest in flowerpots, mailboxes and propane-tank covers (Cornell); NestWatch adds old coat pockets and boots.
| Stage | Cornell Lab | Audubon |
|---|---|---|
| Nest site | Open cavities 3–6 ft up in trees, overhangs and stumps; the first nest sometimes on shaded ground | Any cavity: tree or stump hollows, old woodpecker holes, crevices under roots, brush piles, nest boxes, garage shelves; usually under 10 ft |
| Building | Male starts several, pair finishes one; first nest a week or more, later ones as few as 4 days | Both sexes; female adds most of the lining |
| Clutch | 3–7 eggs | Usually 5–6, sometimes 4–8 |
| Eggs | White, cream or pinkish white with fine rusty-brown spots; 0.7–0.8 in long | White with brown blotches, mostly at the larger end |
| Incubation | 12–16 days | 12–16 days, by the female; the male may feed her |
| Nestling period | 10–16 days | Young leave about 12–14 days after hatching; both parents feed them |
| Broods | 1–3 | 2 a year, 3 in the south |
Nest box (NestWatch)
NestWatch says Carolina Wrens may use boxes built for other species, since a box serves as a "pseudocavity" for a bird that prefers partly enclosed spaces. Its Carolina Wren page lists these measurements (inches):
| Spec | NestWatch value |
|---|---|
| Entrance hole | 2½ |
| Inside depth | 7 |
| Width × length | 5 × 6½ |
| Height above ground | 3–6 ft |
| Spacing between boxes | 330 ft |
| Facing / attach to | Any direction / a building |
Cornell suggests putting the box up well before the breeding season with a predator guard. In cold northern winters, wrens shelter in boxes with dried grass inside, and slotted boxes work better than round holes (Cornell); NestWatch advises leaving boxes up in colder climates for winter roosting. Compare other species in our birdhouse dimensions table.
For your Bird-a-Day streak
Because pairs hold territories year-round (Cornell), a resident Carolina Wren is a reliable "reserve bird" for slow days in the East, by sight or by its song. Plan the rest of your list with the species planner.
Carolina Wren checklist
- Long white eyebrow over a reddish-brown back (Cornell)
- Warm buffy-orange underparts, white throat (Cornell)
- Long, downcurved bill; tail cocked up, held down when singing (Cornell)
- No white tail corners, unlike Bewick's Wren (Audubon)
- Loud teakettle-teakettle song, any month (Cornell, Audubon)
- Suet in winter, a brush pile for cover (Cornell)
Sources
- Carolina Wren Overview — All About Birds, Cornell Lab of Ornithology
- Carolina Wren Identification — All About Birds
- Carolina Wren Life History — All About Birds
- Carolina Wren Sounds — All About Birds
- Northern House Wren Identification — All About Birds
- Bewick's Wren Identification — All About Birds
- Carolina Wren — Audubon Guide to North American Birds
- Carolina Wren nest box — NestWatch, Cornell Lab
- The New Birds of Winter (Marc Devokaitis, February 5, 2015) — All About Birds