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Re: late night thoughts: adults only
I know nothing about many things, and the mechanics involved here are
definitely one of them. But you're right, that is a key question. Wonder what
the sleeping posture was (if any)?
The cartoon I had in mind was sort of a 'squirrel chewing a nut' posture, only
w/ the tail flat on the ground. That would place the jaws as high off the
ground, or higher, than they would be when walking. Although I have no idea if
such is actually feasible.
Anyhow, I do not think the apparent neat fit made when certain famous long
skinny necks w/ little tiny heads are placed between those monster jaws is a
coincidence, although I realize that doesn't necessarily count much as
What I do feel fairly certain of; the probable near-incessant foraging required
to keep a sauropod body fed, combined w/ a fragile slender neck held nearly
parallel to the ground, made them tactically vulnerable to tall, patient bipeds
w/ powerful jaws. I feel the extreme predator/prey weight differential can be
safely ignored and the behavior required of the predator is not overly complex.
Can you imagine? Your skinny neck is 10m long, and is buried in a stand of
trees as you forage busily (large herbivores can get very pushy); when you spot
a squatting T. rex equivalent 5 or 6m away from your head, your options are
limited. Your only reverse gear is double-granny low, sideways motions of the
head are probably constrained by vegetation, and if you lift your head up
suddenly, you pass out.
I understand that consensus is that when T. rex proper was in full flower
sauropods were getting kind of scarce... might have been one prey/predator race
where the predator won. Maybe Horner is right in that they were down and out at
the end; but only if they had run out of the good stuff, in my opinion. }:D.
----- Original Message ----
From: Dann Pigdon <firstname.lastname@example.org>
Sent: Thursday, June 7, 2007 10:21:15 PM
Subject: Re: late night thoughts: not all T. rexes were adults
don ohmes writes:
> Hard to see, specially at night. Although the feathers are a bit much... also
> highly important to my simple mind is the ability to adopt a tripodal
> squatting pose that can be held effortlessly for hours. Anybody got a clue on
> that last?
The huge pubic boot of tyrannosaurs would seem to indicate that a long-term
squat wasn't out of the question. The big question is; how quickly could a
tyrannosaur rise up out of a squat?
Perhaps if it rocked back on it's pubic boot (putting more weight
temporarily onto its tail) while straightening it's legs, then it's head
would be coming down and forward at the end of rising (good for an immediate
strike with the jaws). If it rocked forward however, raising the tail first,
then the head would be moving up and back as it completed rising, meaning it
might miss an opportunity to snap at whatever disturbed it.
Camels get up backside-first (throwing the occasional unsuspecting rider
over its head). I think from memory that horses get up backside-last. What
would be easiest for a tyrannosaur? Given the tiny forelimbs, I'd think
head-first / backside-last would be the better option when rising.
GIS / Archaeologist http://www.geocities.com/dannsdinosaurs
Melbourne, Australia http://heretichides.soffiles.com