The rapid and dramatic environmental changes left the dodo bird helpless. Because it was flightless, it couldn't escape. It needed wings to survive but evolutionary processes don't occur overnight, they take thousands of years.
That's the harsh reality of evolutionary biology - it only optimizes based on the past and present, never the future. Evolution is a reactive process. Environments can increase a species' resiliency over time, or it can change so rapidly that it rids itself of them completely.
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