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Re: Query: Evolution of Pterosaurs



In a message dated 95-09-28 12:28:36 EDT, ornstn@inforamp.net (Ronald
Orenstein) writes:

>
>In short - if archosaurs went into trees back then there were reasons to do
>so besides predator avoidance, though that could well have been one of the
>factors.

I still say the most compelling "reason" to go up into the trees is that your
"enemies" could not easily follow you there. Another "reason" is simply
opportunistic--trees are there in the environment, so use them--and another
"reason" is to capture prey that is trying to evade you by going into the
trees. The latter two "reasons" seem less compelling--because the benefits to
the animal are not as immediate--though they are valid just the same. An
animal's life is not usually in jeopardy if it doesn't happen to use all the
objects in its environment or if a prey animal escapes. But if it cannot
escape pursuit, it's goners and will not leave any more descendants.