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RE: Sauropod Energetics (Peristaltic pump)

Ah, no, the chevrons are not proof of tripodal stance. You just assume
that is true because others have said that is what they are for. In
fact, the elongate chevrons occur in theropods, as well as other
sauropods. Do you assume theropods reared up on their tails to feed on
mammals hiding in tree tops? In theropods the elongate chevrons are
clearly for stiffening the tail, so why couldn't that have been true of
Diplodocus as well? After all, these sauropods probably carried their
tails in the air.

Kenneth Carpenter, Ph.D.
Curator of Lower Vertebrate Paleontology/
Chief Preparator
Department of Earth Sciences
Denver Museum of Nature & Science
2001 Colorado Blvd.
Denver, CO 80205
Phone: 303-370-6392
Fax: 303-331-6492
for PDFs of some of my publications, as well as information of the Cedar
Mountain Project: 

-----Original Message-----
From: Sim Koning [mailto:simkoning@msn.com] 
Sent: Thursday, January 26, 2006 3:23 PM
To: Ken Carpenter
Subject: RE: Sauropod Energetics (Peristaltic pump)

>From: Ken.Carpenter@dmns.org

>The subject of elephants rearing up to feed constantly comes up in 
>discussions on tripodal stance in sauropods as if the two may be 
>equated (not proven by the way). First, elephants rear up to feed only 
>when conditions are such that they are forced to, meaning a drought. 
>When any creature gets hungry, especially under conditions of 
>starvation, that creature will do anything to get food. That does not 
>mean that the extremes used to do so are the norm. There is a big 
>difference between "could" a sauropod rear up on its hind legs and 
>"did" a sauropod rear on its hind legs. I would argue that unless 
>conditions forced it to, that the answer is "no."

Diplodocids (as the name suggests) have "double beamed" chevrons, isn't
this evidence that these animals were adapted to rear up for extended
periods of time, in the same way the large pubic "boot" of tyrannosaurs
is evidence that they rested in a prone position?

>Third, when it comes down to it, all this speculation is untestable 
>anyway and is really a matter of opinion. Sauropods are dead and there 
>is little about their behavior that we will ever REALLY know.

We all know this is just speculation =) Its just a fun intellectual
exorcise to imagine how these animals may or may not have functioned. I
also draw life resorations of dinosaurs as a hobby and when drawing
these animals, I have to do a whole lot of speculation and make a
decision on what I feel is the most realistic way to illustrate these

>Kenneth Carpenter, Ph.D.
>Curator of Lower Vertebrate Paleontology/ Chief Preparator Department 
>of Earth Sciences Denver Museum of Nature & Science
>2001 Colorado Blvd.
>Denver, CO 80205
>Phone: 303-370-6392
>Fax: 303-331-6492
>for PDFs of some of my publications, as well as information of the 
>Cedar Mountain Project:

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