| 1. | Tree swallows will form roosts numbering in hundreds or thousands of individuals.
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| 2. | Thousands of tree swallows forage on the refuge in the late summer.
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| 3. | The field as nest boxes that attract tree swallows and eastern bluebirds.
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| 4. | The trail has 40 birdhouses to attract tree swallows and bluebirds.
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| 5. | Tree swallows and bluebirds can be found in the town.
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| 6. | The mangrove swallow is very territorial when breeding, much like the related tree swallow.
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| 7. | Some of the other species include the tree swallow and several types of warblers.
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| 8. | Four tree swallows, spare, sporty birds, work their blue-green wings.
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| 9. | Research projects focused on red-winged blackbirds, cowbirds, tree swallows, plant succession, insect-goldenrod interaction, and bats.
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| 10. | Dead ahead, a compact swarm of tree swallows with iridescent blue chests swoop down to feed on insects.
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