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RE: Of Tyrant Kings and "running" elephants...
In the T. rex book John Happ describes a Triceratops skull which has
healed-over bite marks on the left supraorbital horn and left squamosal,
indicating that (a) the Triceratops was attacked by a T. rex, and (b) the
Triceratops survived the attack. Happ also cites a reference by Tanke and
Currie (1998) where they describe *unhealed* bite marks on hadrosaur cranial
elements, suggesting that tyrannosaurs may have attacked hadrosaurs by applying
a crushing bite to the head-neck region. Cool stuff!
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> Subject: RE: Of Tyrant Kings and "running" elephants...
> Date: Wed, 14 Jan 2009 05:56:46 +0000
> If you consider the possibility that tyrannosaurids were ambush predators as
> has been proposed, perhaps it would make sense to do a study comparison of
> the known and projected tyranno limb proportions [including assumed juveniles
> (Jane) and mature adults (Sue, Stan)] with that of their potential prey that
> would be likely to have an equivalent speed potential, or slower, for each
> projected onotogenetic stage. Hadrosaurs would be a good initial category for
> this, since at least one individual at the Tyrell definitely was a
> (surviving) prey. If Jane is a Tyrannosaurus, its proportionately large
> forelimbs compared to those of mature adults might imply a more significant
> function in capturing prey than in older individuals.
> MARK HALLETT PALEOART
> 170 W. Ellendale Ave./ Suite 103, #414
> Dallas, OR 97338 USA
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>> From: firstname.lastname@example.org
>> To: email@example.com; firstname.lastname@example.org
>> Subject: Of Tyrant Kings and "running" elephants...
>> Date: Sun, 11 Jan 2009 19:44:21 -0700
>> Mark and Kent,
>> I just received the following book from Amazon Friday:
>> I haven't sat down to read it in detail yet, but it looks pretty cool! In
>> particular I noticed a contribution by a certain Dr. Stevens... :-)
>> Now if only the "Jane" Burpee symposium would ever see the light of day...
>> Speaking of "Jane" I know the majority opinion is that "Jane" is a juvenile
>> T-rex, but there is one osteological feature I'm wondering about. All adult
>> tyrannosaurs have a large bladelike pubic boot. This feature is also present
>> in juveniles of Albertosaurus, Daspletosaurus and Tarbosaurus. In "Jane",
>> the anterior expansion appears to be absent... ???
>> I was watching the amazing footage from "Planet Earth" last night of the
>> elephant-lion encounter.
>> During parts of it the elephant's gait appears to come *very* close to a
>> trot, though whether it was or not would probably require analysis.
>> Concerning running tyrannosaurs, I don't think there's much doubt that
>> juveniles/subadults could run... the question is whether adults
>> (particularly T.rex) could do it. Part of the argument that big tyrannosaurs
>> could run is that most modern vertebrates do not display significant
>> ontogenetic shifts in gait with increasing size. There is one example of
>> this, though, which may or may not be relevant.
>> Juvenile Australian salt-water crocodiles sometimes exhibit a galloping
>> gait, which they primarily use to quickly escape to the water from land.
>> This gait has been documented in crocs
>> up to 1.5 m long, but larger animals have never been seen using this gait.
>> Perhaps the larger ones are so big that it is biomechanically impossible???