Although the Eastern Bluebird (Sialia sialis), never quite made the endangered species list, it declined as much as 90% over much of its breeding range during this century and for this reason it has been and remains a species of special concern. Loss ofhabitat, and other detrimental actions by man such as the use of DDT and introduction of the House Sparrow (Passer domestic us) and European Starling (Sturnus vulgaris), have been primarily responsible for the marked decline of the bluebird population.
Author: John Findlay
Volume Number: 34 Year Published: 1987
Issue Number: 1
Page Number: 7
Link to article: http://birdlife.aosbirds.org/1987/Vol 34 No. 1_1987_p7-8.pdf
Link to the full issue of BirdLife: http://birdlife.aosbirds.org/1987/Vol 34 No. 1_1987.pdf