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Fun Facts
Did You Know?
Winter confusion centers on separating the tree swallow from the rarer swallows that occasionally overwinter or show up early in spring. The barn swallow wears an orange throat, deeply forked tail, and darker blue back. The tree swallow wears clean white below and blue-green above with a shallowly notched tail. The barn swallow's orange face settles the comparison before any other feature registers
If This Animal Could Talk...
"Watch closely, respect my space, and let my habitat explain the rest of the story."
Every other swallow in North Louisiana depends entirely on flying insects and leaves when the insects stop flying. The tree swallow eats berries. That single dietary addition, the ability to switch from flying insects to wax myrtle berries and bayberries when cold weather grounds the bug supply, separates the tree swallow (Tachycineta bicolor) from every other North American swallow in one critical way: the tree swallow can survive cold snaps that would starve a barn swallow in two days. The berry trick keeps the tree swallow alive in North Louisiana through winter while every other swallow species has departed for Central or South America. The tree swallow looked at November and said "I can work with this." Every other swallow looked at November and left.
The tree swallow winters across the southern United States, and North Louisiana sits within the wintering range. The bird breeds farther north, across the northern tier of states and into Canada, but spends the cold months in the coverage area in flocks that can number from dozens to thousands. A winter flock of tree swallows over a wax myrtle thicket in the coverage area swirls, dips, and rises in coordinated flight patterns that look choreographed and function as a feeding strategy. The bird stayed for the berries. The berries stayed for the winter. The arrangement works.
A Few More Facts
How they hunt and forage: Flying insects during the warm months. Flies, beetles, ants, mosquitoes, and the full aerial insect roster that every swallow in the coverage area targets. The tree swallow hunts on the wing with the standard swallow approach: gliding, banking, intercepting prey in midair, processing in the bill, continuing without pause. Berries during the cold months. Wax myrtle berries, bayberries, and dogwood berries enter the diet in fall and dominate through winter. The dietary shift separates the tree swallow from every other North American swallow and explains the species' ability to winter in North Louisiana. A tree swallow at a wax myrtle thicket in December eats berries that no other swallow in the Western Hemisphere would recognize as food. The tree swallow discovered the loophole. The tree swallow has been exploiting the loophole for millions of years. The other swallows have not copied the strategy. The other swallows have chosen South America. Both approaches work. Only one approach lets the bird skip the Gulf crossing.
Live birth or eggs? no
When young are born: See the detailed species sections below.
Photo Gallery
What Is the Tree Swallow Often Confused With?
The adult male wears brilliant iridescent blue-green above, clean white below, with no wing bars, no rump patch, and no forked tail. The blue-green iridescence shifts with the light angle, looking steel-blue in one moment and bright green the next. In direct sunlight, the tree swallow's back flashes with a metallic quality that the barn swallow's darker blue doesn't match. The tree swallow wears chrome. The barn swallow wears matte. Both look good. The tree swallow looks shinier. The female: duller, with brownish-green upperparts that develop more blue-green with age. First-year females can look entirely brown above, which creates confusion with the bank swallow and the rough-winged swallow until the clean white underparts and the lack of a breast band sort things out. An older female tree swallow wears nearly as much iridescence as the male. A younger female wears nearly none. The bird grants flashiness as a reward for survival, which from the tree swallow's perspective amounts to the only promotion system that has ever worked.
Drag the handle left and right to compare Tree Swallow side by side with the species it gets mistaken for most.
Open the visual comparison tool
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Accessibility
Choose stable, publicly accessible viewing areas and use binoculars or a zoom lens when terrain, water, vegetation, or distance limits close observation.
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Frequently Asked Questions
Does Tree Swallow live in North Louisiana?
Yes. Every other swallow in North Louisiana depends entirely on flying insects and leaves when the insects stop flying. The berry trick keeps the tree swallow alive in North Louisiana through winter while every other swallow species has departed for Central or South America. The tree swallow winters across the southern United States, and North Louisiana sits within the wintering range
How do you identify Tree Swallow?
The adult male wears brilliant iridescent blue-green above, clean white below, with no wing bars, no rump patch, and no forked tail. The blue-green iridescence shifts with the light angle, looking steel-blue in one moment and bright green the next. In direct sunlight, the tree swallow's back flashes with a metallic quality that the barn swallow's darker blue doesn't match. The tree swallow wears chrome. The barn swallow wears matte. Both look good. The tree swallow looks shinier. The female: duller, with brownish-green upperparts that develop more blue-green with age. First-year females can look entirely brown above, which creates confusion with the bank swallow and the rough-winged swallow until the clean white underparts and the lack of a breast band sort things out. An older female tree swallow wears nearly as much iridescence as the male. A younger female wears nearly none. The bird grants flashiness as a reward for survival, which from the tree swallow's perspective amounts to the only promotion system that has ever worked.
What does Tree Swallow eat?
Flying insects during the warm months. Flies, beetles, ants, mosquitoes, and the full aerial insect roster that every swallow in the coverage area targets. The tree swallow hunts on the wing with the standard swallow approach: gliding, banking, intercepting prey in midair, processing in the bill, continuing without pause
Is Tree Swallow dangerous to people?
The tree swallow's winter presence in North Louisiana makes it the swallow most people can see year-round in the coverage area. Every other swallow departs by October. The tree swallow stays. A birder who wants to see a swallow in North Louisiana in January has exactly one option, and that option wears blue-green and eats wax myrtle berries