This is an eastern bluebird. This one was spotted in the Cromwell Valley Park in Baltimore County, Maryland.
The Eastern Bluebird had been in serious decline in past decades because the European Starling and the House Sparrow, both non-native species, have overtaken the nesting sites of bluebirds. Large numbers of bluebird nesting boxes have been constructed in parks and wildlife refuge areas and these boxes have stopped the Eastern Bluebird population decline and the population is increasing again.
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