How did the dodo survive?

Could you elaborate on the methods by which the dodo, a now-extinct bird, was able to sustain itself in its natural habitat? Were there any unique adaptations or behaviors that allowed it to thrive despite its seemingly vulnerable state? Were there any environmental factors that contributed to its survival, or were there any threats that it had to overcome in order to persist? I'm particularly curious about the specific challenges it faced and how it managed to overcome them, given its now-infamous status as a victim of extinction.