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Re: Lack of Running Giant Theropod Tracks
On Mon, Nov 29th, 2010 at 8:50 PM, Mike Taylor <email@example.com> wrote:
> Do we know of any extant animals in which the juveniles can run faster
> than the adults? While no doubt there must be a way exceptions (sea
> squirts? :-)), I think they ARE exceptions. I'm not convinced by the
> widespread a priori assumption that adult ceratopsians and
> tyrannosaurs were slower than the juveniles.
I don't know about 'faster', but baby rhinos certainly run 'more often' than
their parents. In fact it
seems that young rhinos only have two speeds - a flat-out run, and asleep. :-)
Perhaps the issue isn't about speed, but rather endurance?
Also; the bigger you get, the more you become inertia's and momentum's biatch.
A large adult
tyrannosaur would need to overcome a lot more inertia to get to a fast run, and
then have to
counteract a lot more momentum to come to a safe stop again. Juveniles could
and decelerate more quickly.
If tyrannosaurs didn't hunt in groups, then perhaps there was a major change in
as they got older - from prolonged agile chases as juveniles to primarily
ambush predator at larger
sizes (or scavenger, or kill-stealer).
If they did hunt in groups, then having younger and more agile members do the
larger members waiting in ambush, might have been a better strategy that played
> I'm not getting into the bit of the argument; I'll just state for the
> record that I think Don in GROSSLY overstating the vulnerability of
> sauropods, and move on.
I can envisage how a boy scout could kill a sauropod. It involves the sauropod
swallowing said boy
scout whole, and subsequently choking to death.
Spatial Data Analyst Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj