[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: more dinosaur extinction stuff
On Mon, 1 Aug 1994, Stan Friesen wrote:
> >... Instead of why did the dinosaurs go extinct I wondered why
> > did the mammals, lizards, fish, birds etc survive the same calamity?
> It is fairly simple, really. In all of the big extinctions,
> generalists and opportunists do well, specialists do poorly.
> Also, large animals do poorly, and small ones do better. (This
> is actually a special case of the above, as large animals are
> almost always specialists in one way or another).
It is true that mammals, lizards, turtles, alligators, crocodiles, birds,
etc. did survive...but all those groups took quite a pounding also..
I believe I read somewhere that almost 60-80% of all life was effected.
I agree that generalists and opportunists do well against calamity.
Dinosaurs at the end of the mesozoic were definitely specialized...maybe
to specialized. A lot of work is still needed to prove this.!!
(Birds are specialized/highly evolved dinosaurs....so not all of them died!!!)
---John Schneiderman <email@example.com>