Comment Re:Ecosystem (Score 1) 108
If the Passenger Pigeon has been extinct for this long, it's safe to say that ecosystems have adjusted to their demise. Let's not see what the consequences of re-introducing them are.
AFAIK there wasn't any dramatic changes when the PP went extinct, so whatever function they had, some other species took over - in engineering terms, the ecosystem switched to using Backup Pigeon System. If so, then re-introducing Passenger Pigeon is analogous to getting primary system back online, which is a good thing both because it re-introduces a layer of redundancy, as well as allows the ecosystem to return to the balance its species have evolved into (and haven't have time to evolve out of), thus giving much-needed stress reduction on a system already facing enough challenges.