"They stayed for about a week, but then got chased out by some tree swallows, " he said.
12.
Tree swallows are known to " fight " over feathers in mid-air for reasons which are still under investigation.
13.
Like the related tree swallow, this species is very aggressive to other hirundines when breeding and is very territorial.
14.
Nesting boxes and berry planting have also brought smaller birds like tree swallows, northern flickers, and salt marsh yellowthroats.
15.
He said that bluebirds naturally face a lot of competition for nesting space from the more aggressive tree swallow.
16.
An abundant insect population supports insectivorous birds including western kingbirds, ash-throated flycatcher, tree swallows, barn swallows, black phoebes, and others.
17.
Tree swallows are typically single-brooded, although they may attempt a second nest if the first fails early in the season.
18.
Single-day totals of common birds exceed 10 & thinsp; 000 individuals for species like tree swallows, oldsquaws, and yellow-rumped warblers.
19.
For example, molecular ecology revealed promiscuous sexual behaviour and multiple male partners in tree swallows previously thought to be socially monogamous.
20.
They nest in cavities or in nest boxes, competing with tree swallows, house sparrows, and European starlings for natural nesting locations.
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