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Dr. Zeleny has devoted all his efforts to the nationwide effort to save the bluebird. During the past forty years, the numbers of the eastern bluebird (Sialia sialis) may have plummeted as much as 90 per cent. The mountain bluebird in the Rocky Mountain region and the western bluebird have suffered less, but gradually they are succumbing to the same pressures. Two rival birds, the starling and the house sparrow, have contributed to the catastrophe. These aggressive interlopers like to nest -in the same natural or man-made enclosures required by the mildermannered bluebirds.
People, too, have sped the decline. In city and countryside; dead trees with cavities; that once provided bluebird nesting sites have been cqt down and hauled away. ■
Old tvooden posts where bluebirds once found cozy hollows have been replaced
83.6%