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In a message dated 95-12-02 15:19:43 EST, ornstn@inforamp.net (Ronald
Orenstein) writes:

>I suspect that in at least some of such cases the evolution of large size
>and cursorial ability (as in living birds such as the larger bustards) may
>have reached a stage before the loss of flight such that the evolution of
>still larger size and further cursorial (or graviportal, or even predatory)
>adaptations became more selectively advantageous than the retention of
>flight which might have made such adaptations impractical.  This is quite
>different from the scenario of insular release that has been used to explain
>most cases of flightlessness in recent times (eg flightless insularrails,
>ibises etc.).

It's certainly possible.