题目选项分析

Like the large tracts of unbroken forest that the pileated woodpecker requires to both feed and nest year-round as a non-migrating species, that the birds themselves are disappearing in the eastern United States is due to suburban commercial developments and the introduction of invasive species.

Like the large tracts of unbroken forest that the pileated woodpecker requires to both feed and nest year-round as a non-migrating species, the bird itself is disappearing in the eastern United States as a consequence of suburban commercial developments and of the introduction of invasive species.