EASTERN BLUEBIRD

Eastern Bluebird
Copyright © 2005 Eric Secker

Conservation Concern: NONE

Population Trend: Increasing
Credibility: Moderate

The Eastern Bluebird is a fairly common breeder in the CW Region and common in areas further south. Eastern bluebirds usually nest in tree cavities or bluebird boxes in forest edges, savannas, and mowed fields. Harsh winters can have noticeable negative impacts on this species in our area. This species has benefited greatly by the prevalence of bluebird boxes in residential areas and preserves in the Chicago area.

Trend Level

Interpreting the Data | Analysis Methods | Disclaimer | Contact Us

Avg. Yearly
Rate of Change:

The vertical axis numbers represent an index of the population change.

Note that the scales may vary between graphs.

Avg. Yearly
Rate of Change*:

27%

10%

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 100

Sample Size (Records): 47

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-20 to 75

GOODNESS OF FIT:
Chi-square: 36.99, df 34, p 0.3325
Likelihood Ratio: 42.19, df 34, p 0.158
AIC: -25.81
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

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1997-2004 Trend Point Count Data	1988-2004 Trend* All Observation Types