dont forget the impact of the introduction of house sparrows and starlings who compete for nests and damage eggs of bluebirds, it is the same in the east with the eastern bluebird their numbers are on the rise due to nest boxes and possibly other factors as well.
dont forget the impact of the introduction of house sparrows and starlings who compete for nests and damage eggs of bluebirds, it is the same in the east with the eastern bluebird their numbers are on the rise due to nest boxes and possibly other factors as well.
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