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Re: (fwd) Re: Mammals as a cause of Dinosaur extinction




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> From: Garrison Hilliard <garrison@efn.org>
> To: dinosaur@usc.edu
> Subject: (fwd) Re: Mammals as a cause of Dinosaur extinction
> Date: Wednesday, December 17, 1997 1:00 PM
> 
> On 17 Dec 1997 20:34:38 -0500,  "Stan Engel"
> <thorisporn@worldnet.att.net> wrote:
> 
> 
>?
> 6. Lots of species and genera have been forced into extinction from
> competition with other lifeforms.This is the case for
> Multituberculates,
> Trilobites, Creodonts to name a few. The Dinosaurs, however, would
> have
> "reigned" until now had it not been for a fortuitous meteor. They were
> oddly
> immune from competition.
> 7. Small animals _can_ kill large ones. Watch enough nature flicks and
> you'll come across the episodes where a pack of Hyenas is in the
> process of
> killing an infant Rhinoceros.
6. Dinosaurs were not "immune" to competition, there just wasn't really
anything other than other dinosaurs to compete with. Mammals were too small
at the time to fill many of the niches dinosaurs held, and crocodiles were
mostly restricted to bodies of water. What else was there really? Also, as
has been stated before, it almost definitely was not just a "fortuitous
meteor" that caused the dinosaurs extinction.
7. But compare the size differences! An infant rhino is perhaps 3-5 times
heavier than a single hyeana. A mammal probably could "take out" a very
young dinosaur, but once the dinosaur reached a certain size, it would no
longer be efficient for the mammals to hunt it. 
                                                                           
                             BHR

>