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Message: <blockquote data-quote="duncan fraser" data-source="post: 2712197" data-attributes="member: 48629"><p>It wouldn't take a small change in the ecosystem. Birds that have survived for thousands of years are more robust than that, and could survive certain changes in their ecosystem. It would have to be  a very substantial change to prevent reintroduction. In evolutionary terms, 200 years is a very short period of time. WTEs came back after 100 years absence.</p></blockquote><p></p>