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Re: If the asteroid had missed...



On 3/15/07, jbois@verizon.net <jbois@verizon.net> wrote:
Michael wrote:
>Ah, but here's the rub: even if you are correct, the modern faunal
composition probably wouldn't exist without the bolide effects, which creates a 
bit of a Catch 22.

Certainly.  However, the animals that seem to do most of the predation on 
extant large nesters (e.g., armadillos, birds, lizards) are not extravagantly 
different from pre-boundary animals.  Most explanations for the absence of 
large dinosaurs invoke preresidential advantage of current niche holders.  Yet, 
terror birds staged a large carnivorous come back in SA.  Why was this the only 
one (?).  And why did it ultimately fail?  I agree that the invaders were quite 
different from boundary types...still.


The Diatrymiformes (NA and Eurasia) and Dromornithidae (Australia) were both large and possibly carnivorous.

--
Andreas Johansson

Why can't you be a non-conformist just like everybody else?