[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Numbers of Dinos???
On Wed, 30 Nov 1994, Stan Friesen wrote:
> From: firstname.lastname@example.org
> > Does anyone have an idea how many T-Rexes there were? Are we looking at a
> population of a few or
> > are we looking at a situation where there were literally hundreds of
> thousands scattered everywhere?
> > Were dinos common?
> Hundreds of thousands alive at one time is *extremely* rare.
> Most uncommon animals have populations in the low millions.
> As to actual numbers, no we really don't know. However, based
> on specimen counts, T. rex was rather uncommon (about a dozen
> specimens, not counting teeth). On the other hand, Triceratops
> was *very* common, with over thirty skulls, and many more individual
> bones. Edmontosaurus and Anatotitan have similar specimen counts.
> This is pretty much what is expected, the herbivores are common,
> the large carnivores are relatively uncommon.
> The large numbers of the large heribvores suggests an actual
> abundance approaching that of the American bison, or the East
> African antelope. If so, then T. rex may have been about as
> common as lion or hyaena packs (perhaps one T. rex in area that
> would sustain a single pride of lions)
> This adds up to alot of individuals. The species ranged at
> least from central Alberta to northern Utah, and from the edge
> of the Rockies east past the Black Hills. This is a great many
> square miles. [T. rex *may* have ranged as far north as the
> northern Alaska, and as far south as the Mexican border, but
> that is based on fragmentary specimens, and is uncertain].
> Based on certain assumptions, I once estimated that the total
> number of Triceratops that ever lived (over the whole several
> million years of their existance) exceeded a trillion individuals.
> [This gives you an idea of the sampling rate: some 50 to 100
> individuals out of a couple trillion].
> email@example.com firstname.lastname@example.org
> The peace of God be with you.
In the Hell Creek we found that about 4 per cent of dinosaur individuals