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RE: Tyrannosaurus Tail Torque‏

There was pretty good footage of Komodo's killing a Buffalo in the BBC Life
series with Sir David Attenborough.  Sadly it's not on You Tube.

-----Original Message-----
From: Jura [mailto:pristichampsus@yahoo.com] 
Sent: 22 November 2010 04:00
To: dinosaur@usc.edu
Subject: Re: Tyrannosaurus Tail Torque‏

Curse that truncation demon.

The "unabridged" paragraph read:

Fry et al (2009) found that Komodo dragons do indeed have venomous saliva,
and that it causes hypotension (as demonstrated at 8m28s in the video) which
seems to aid dragons in taking down large prey, but in no means is this
their primary mode of hunting. 


--- On Sun, 11/21/10, Jura <pristichampsus@yahoo.com> wrote:

> From: Jura <pristichampsus@yahoo.com>
> Subject: Re: Tyrannosaurus Tail Torque‏
> To: dinosaur@usc.edu
> Date: Sunday, November 21, 2010, 10:57 PM
> --- On Sun, 11/21/10, Sim Koning
> <simkoning@msn.com>
> wrote:
> > -----
> >  
> > Regarding Komodo dragon's and their bite. Watch the
> video
> > and you'll notice that the dear's leg is *rotting* due
> to a
> > bite. They walk up to ungulates and bite them on the
> leg,
> > they get an infection and then they track them down
> and eat
> > them while they are still alive. There are plenty of
> other
> > videos showing them biting animals on the leg for the
> same
> > reason. These animals eat rotten *putrid* meat on the
> > shoreline... you WOULD NOT want to get bit by one. 
> >  
> > http://www.youtube.com/watch?v=KfTgkJHpdsM
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Not to get too off on a tangent here, but this is the
> non-sped up version of the video you linked to, with the
> relevant section highlighted. 
> http://www.youtube.com/watch?v=ViisuDKqKuI&t=6m53s
> Documentaries are tough to judge for examples of animal
> behaviour as one must take into account how the footage was
> chopped up to "tell the story." In this case, it looks like
> the entire attack took place in one day. The actual attack
> takes place at 7m44s, assuming it is the same deer (if
> slowed down enough one can see the deer that was attacked
> had a healthy left rear leg). 
> The point remains that there has never been a credible
> observation of Komodo dragons using bite and release as a
> means of killing their prey (the dragon in the video backs
> away at one
eer before it collapses). 
> Walter Auffenberg (1981) took extensive notes on his
> observations of wild dragons hunting. His notes include
> observations on natural attacks, as well as staged attacks
> (where his team tethered a goat to a post and waited for a
> dragon to come by). In the case of the latter, he also took
> pictures and drawings of the killing process. At no point in
> these attacks did the dragon ever just walk off and wait for
> the animal to die. In fact it was quite the contrary, with
> Auffenberg describing the attacks as extremely violent
> affairs. 
> Fry et al (
> nd that it causes hypotension (as demonstrated at 8m28s in
> the video) which seems to aid dragons in taking down large
> prey, but in no means is this their primary mode of hunting.
> Honestly the only reptiles that have ever been shown to
> reliably use a "bite and release" strategy are vipers. 
> _____________________________________________________________
> >  
> >  
> > Also, more on topic. Do you guys think it's possible
> that
> > giant theropods could have had an elastic strain
> energy
> > storage tendon/s in their lower legs (like macropods)
> that
> > may have given them more "free" energy while running?
> I was
> > just reading about how such a system remains efficient
> even
> > when weight is increased. I also suspect that the
> > caudofemoralis was very elastic and may have stored
> energy
> > as the tail "wagged" side to side. What do you guys
> think?
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Muscles can store strain energy, though it is often small
> compared to the storage capacity of tendons (Alexander &
> Clark 1977). I don't know if any elastic storage tests have
> been performed on the caudofemoralis, though it would appear
> to be plenty powerful enough to handle long walks, or bursts
> of acceleration all on its own.
> More on this very subject in the very near future. :)
> Jason
> References
> Auffenberg, Walter, 1981, The Behavioral Ecology of 
ander, R.MCN., Bennet-Clark, H.C. 1977. Storage of
> Elastic Strain Energy in Muscle and Other Tissues. Nature.
> Vol.265:114-117
> Fry, B., Wroe, S., Teeuwissed, W., van Osch, M.J.P.,
> Moreno, K., Ingle, J., McHenry, C., Ferrara, T., Clausen,
> P., Scheib, H., Winter, K.L., Greisman, L., Roelants, K.,
> van der Weerd, L., Clemente, C.J., Giannakis, E., Hodgson,
> W.C., Luz, S., Martelli, P., Krishnasamy, K., Kochva, E.,
> Kwok, H.F., Scanlon, D., Karas, J., Citron, D.M., Goldstein,
> E.J.C., Mcnaughtan, J.E., and Norman, J. 2009. A Central
> role for Venom in Predation by Varanus komodoensis (Komodo
> Dragon) and the Extinct Giant Varanus
> 06