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Re: Big Dinosaur Prints Found
> Wow. This pretty much blows away everything I thought I understood
> about dinosaurs (again :-) I can imagine how a lazy sauropod could
> leave a tail-drag -- the older sauropod mounts looks believable in the
> posture they give the dragging tails. But a theropod? When I think
> of the shape of a _Dilophosaurus_, the only way I can see it making
> any kind of drag mark is if the body is held in a best 1959s-style
> upright posture. Is that what was going on here? Or are theropod
> tails more dorso-ventrally flexible than I'd thought? And if so,
> didn't it entail a lot of (wasted) muscular effort to keep them off
> the ground for the 99% of the time that they seem to have been held
Like you said, the animal had to be upright in order to drag the tail, like
a see-saw. So it is balanced when positioned horizontally, and doesn't
require that extra muscle effort. Wasn't it mostly ligaments, anyway?
And a trackway is a snapshot of dinosaur behavior, as well as a footprint.
We have no idea what was happening at that instant. Maybe a mating display?
Maybe trying to look imposing by getting taller? Who knows. It obviously
does not indicate a normal activity, because no other trackways of this
animal show this. This doesn't necessarily change anything about the
morphology of dinosaurs.