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Re: If the asteroid had missed...
On Wednesday, March 14, 2007, at 08:33 AM, email@example.com wrote:
Dinosaurs are still here...they are just no longer competitive in the
large animal niche. Predatory tactics of birds, mammals, and reptiles
are probably prohibitive for any animal whose nest is dependent upon
defending a nest in the open field (crocs having the advantage of
ambushing a nest predator _and_ seeing very well at night...a luxury
probably not afforded most dinosaurs).
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. Of course, we've debated this point
before and I know we're in relatively stark disagreement about possible
causal factors for higher-clade level, global extinction events, as
well as the relative importance of viviparity in mammals.
Michael Habib, M.S.
Center for Functional Anatomy and Evolution
Johns Hopkins School of Medicine
1830 E. Monument Street
Baltimore, MD 21205
(443) 280 0181