Eastern Bluebird Dossier

by Carl Strang

A couple weeks ago I shared my dossier on the great blue heron. Today’s choice is an example of a species for which I have not made a lot of observations, and so my personal knowledge is more limited.

Eastern Bluebird

As a child, occasionally I saw these at the horse-jumping practice ground in the Culver Military Academy’s Bird Sanctuary near Culver.

They nested in birdhouses mounted on posts in a tall-grass meadow with widely scattered trees at the Tyler Arboretum near Philadelphia in 1980.

I saw them in a similar area in spring 1986 at Waterfall Glen Forest Preserve, DuPage Co. I also saw them in southern Illinois at Giant City State Park. [Bluebirds once were so uncommon that simply listing the places where I had seen them was most of what I could write when I first created this dossier].

23MR88. A bluebird singing from the top of a nest box, one of those posted out from a fencerow. [Location not indicated; Blackwell?]

29AP90. Indian Knoll Schoolyard, near Winfield Mounds Forest Preserve. Bluebird foraging on mowed lawn by perching 8-15 feet up and sallying out 20-40 feet from perch to land on ground and take food, then returning to same perch or moving to another. [I since have concluded that this version of sit-and-wait foraging is their primary hunting method. Other birds I have seen hunting in this way are Australia’s kookaburras. Of course, the latter are after larger insects, small lizards, etc.]

20FE93. Bluebirds at the boundary between Hidden Lake F.P. and Morton Arboretum.

6FE99. Bluebirds wintering in a savannah area in the Morton Arboretum.

29AP00. Apparent territorial boundary dispute between two male bluebirds near prairie at Morton Arboretum. Song “peer, peer, poowee,” wings flutter when singing. Flying bird has an appearance like horned lark or swallow.

8OC00. Flock at West Chicago Prairie.

26MY01. A protracted dispute between a pair of bluebirds and a pair of tree swallows at a nest box in the prairie area at the Morton Arboretum’s Heritage Trail. The male bluebird was at the entrance on the outside of the box, with the female on the ground nearby, when the swallows arrived. At first it appeared that the swallows were attempting to chase the bluebirds away, but then the male bluebird became vigorous in chasing after the swallows. After 5 minutes of this, the bluebirds backed off and a swallow took the perch on top of the house. Soon, though, the bluebirds returned and the male resumed his attack. I never saw any of the birds enter the house.

5JA06. Fullersburg. A small flock of bluebirds feeding on honeysuckle berries near the Visitor Center bridge. (These stayed around for another week or so).

4AU09. Mayslake. Bluebirds nesting near the chapel have fledged at least one youngster.

(Dates are coded with the day, two-letter month code, and two-digit year).

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