Connecticut Warbler (Oporornis agilis)

Connecticut Warbler

[order] PASSERIFORMES | [family] Parulidae | [latin] Oporornis agilis | [UK] Connecticut Warbler | [FR] Sylvette a gorge grise | [DE] Augenring-Waldsanger | [ES] Reinita ojianillada | [NL] Connecticuzanger


Monotypic species

Physical charateristics

Similar to MacGillivray’s and Mourning warblers (gray hood, yellow and olive body), but note the complete white eye-ring.
Fall female and young are duller and lack the gray hood, but have a suggestion of one (a brownish stain across the upper breast). The eye-ring is always present. This species walks.

Listen to the sound of Connecticut Warbler

[audio: Warbler.mp3]

Copyright remark: Most sounds derived from xeno-canto

wingspan min.: 21 cm wingspan max.: 22 cm
size min.: 13 cm size max.: 15 cm
incubation min.: 11 days incubation max.: 12 days
fledging min.: 8 days fledging max.: 10 days
broods: 1   eggs min.: 3  
      eggs max.: 5  


North America : nc


Poplar bluffs, muskeg, mixed woods near water; in migration, undergrowth.
In breeding season, in United States and eastern Canada, prefers bogs with black spruce or tamarack. In western Canada nests on dry ridges and in open poplar or aspen stands. In migration, found in undergrowth of lowland woods or in dense thickets in mead


Details of breeding behavior not well known. Males sing from trees to defend nesting territory.
Hidden in sphagnum moss hummock. In poplar woods, placed next to bunch of dry grass or weeds. Nest is an open cup, constructed of leaves, grass, and bark strips, or sometimes a simple hollow in moss lined with finer stems of grass.
Eggs: Usually 4-5. Creamy white, with black, brown, or lilac spots. Incubation period and parental roles in incubation not well known. Apparently only rarely parasitized by cowbirds.
Young: Both parents apparently care for young, but which parent
has most responsibility for feeding nestlings and how long young are in the nest are not well known. Both parents help feed fledglings for some time after they leave the nest.

Feeding habits

Mostly insects. Details of diet have not been well studied. Undoubted
ly feeds mostly on insects, as other warblers do. Reported to feed its young on green caterpillars, also observed eating spiders, snails; sometimes eats seeds and raspberries.
Mostly forages by walking on the ground, seeking insects among the leaf litter, sometimes flipping over dead leaves. Also walks along branches, picking prey from crevices in bark. In migration, may forage in small flocks with others of its kind.


This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Connecticut Warbler status Least Concern


Central-southern Canada, central-northern United States. Winters in northern South America. Migration:
Migrants enter and leave our area mostly via Florida, moving north-northwest in spring toward Great Lakes, moving south in fall mostly along Atlantic Coast. Migrates relatively late in spring and early in fall. Very rare vagrant in West.

Distribution map

Connecticut Warbler distribution range map

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