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Fun Facts
Did You Know?
During migration, black-throated green warblers travel in mixed-species flocks that include Tennessee warblers, magnolia warblers, American redstarts, black-and-white warblers, and whatever other species happen to be migrating simultaneously. Within these flocks, black-throated greens typically occupy the upper canopy, foraging on outer branch tips and leaf surfaces where their active, sally-based foraging technique is most effective
If This Animal Could Talk...
"Watch closely, respect my space, and let my habitat explain the rest of the story."
Black-throated green warblers sing a buzzy, distinctive song that birders have been transcribing as "trees, trees, I love trees" for generations — and the mnemonic works well enough that most birders learn the song on their first encounter and never forget the species. Setophaga virens breeds in coniferous and mixed forests from Canada through New England and the Appalachians, far north of North Louisiana's pine-and-hardwood landscape. But every spring and fall, these bright-faced warblers pass through the region in mixed-species migration flocks, adding a welcome flash of brilliant lemon-yellow and deep moss-green to the canopy of every wooded habitat in all 26 parishes.
North Louisiana sits squarely on the migration route between the breeding grounds in the boreal and montane forests of eastern North America and the wintering grounds in Mexico, Central America, and the Caribbean. A black-throated green warbler that spent the winter foraging in a Honduran mountain forest and will spend the summer singing from a New Hampshire spruce canopy passes directly through North Louisiana's airspace — and through North Louisiana's forests, where the bird stops to rest and refuel before continuing the journey.
A Few More Facts
How they hunt and forage: Black-throated green warblers eat primarily non-hairy caterpillars during the breeding season, supplemented by beetles, flies, aphids, spiders, and other small arthropods. During migration through North Louisiana, the diet includes whatever insects the canopy provides, plus occasional berries from fruiting shrubs. Foraging occurs primarily in the canopy, where the bird gleans insects from the upper surfaces of leaves and small branches with rapid, active movements. Hover-gleaning — pausing in mid-air to pick insects from the undersides of leaves — supplements the standard gleaning technique. Black-throated greens forage more actively than many other warblers, making frequent short flights between foraging sites that create the constant movement birders associate with warbler flocks in the canopy.
Live birth or eggs? no
When young are born: The species' continued abundance despite these cumulative threats reflects the reproductive success that the boreal breeding grounds provide — enough young birds produced each summer to replace the mortality that migration and wintering impose.
What Is the Black-Throated Green Warbler Often Confused With?
Adult males are among the most visually striking warblers that pass through North Louisiana: bright yellow face with an olive-green ear patch, moss-green crown and back, bold white wing bars, a black throat and upper breast, and heavy black streaking on the white flanks. The yellow face glows against the green back and black throat with a color combination that makes the male unmistakable in good light at any reasonable distance. Females and immature males show the same yellow face and green back but replace the solid black throat with a pale or whitish throat and reduced black markings on the breast. Even dull immatures retain enough of the yellow-face-plus-green-back pattern to identify the species within the context of a mixed flock during fall migration.
Drag the handle left and right to compare Black-Throated Green Warbler side by side with the species it gets mistaken for most.
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Accessibility
Accessibility
Black-throated green warblers provide an accessible migration-season warbler encounter during spring and fall. The persistent, buzzy song is distinctive and identifiable by ear, making the species detectable even when the bird forages high in the canopy where visual observation is difficult.
For visitors who are blind or have low vision, the zee-zee-zee-zoo-zee song pattern is one of the most recognizable warbler songs in the region during spring migration — buzzy, patterned, and persistent enough to identify the species within seconds of hearing the first phrase.
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Frequently Asked Questions
Does Black-Throated Green Warblers live in North Louisiana?
Yes. Setophaga virens breeds in coniferous and mixed forests from Canada through New England and the Appalachians, far north of North Louisiana's pine-and-hardwood landscape. But every spring and fall, these bright-faced warblers pass through the region in mixed-species migration flocks, adding a welcome flash of brilliant lemon-yellow and deep moss-green to the canopy of every wooded habitat in all 26 parishes.
North Louisiana sits squarely on the migration route between the breeding grounds in the boreal and montane forests of eastern North America and the wintering grounds in Mexico, Central America, and the Caribbean.
How do you identify Black-Throated Green Warblers?
Adult males are among the most visually striking warblers that pass through North Louisiana: bright yellow face with an olive-green ear patch, moss-green crown and back, bold white wing bars, a black throat and upper breast, and heavy black streaking on the white flanks. The yellow face glows against the green back and black throat with a color combination that makes the male unmistakable in good light at any reasonable distance. Females and immature males show the same yellow face and green back but replace the solid black throat with a pale or whitish throat and reduced black markings on the breast. Even dull immatures retain enough of the yellow-face-plus-green-back pattern to identify the species within the context of a mixed flock during fall migration.
What does Black-Throated Green Warblers eat?
Black-throated green warblers eat primarily non-hairy caterpillars during the breeding season, supplemented by beetles, flies, aphids, spiders, and other small arthropods. During migration through North Louisiana, the diet includes whatever insects the canopy provides, plus occasional berries from fruiting shrubs
Is Black-Throated Green Warblers dangerous to people?
No. This species is not dangerous to people when it is observed without handling or disturbance
