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> Why? If one now accepts that smaller Diplodocoideans could
> rear, what stops the larger ones from doing the same since they were
> functionally nearly identicle?
=Oh, most species probably could, when necessary, they just had less
=reason to do so.
=As to functionally identical, I think Brachiosaurus was rather
=different. Its heavy *fore*quarters and short tail would have made
=rearing up *much* more difficult than in other types of saurpopds.
OK, OK, OK...
so a bunch of sauropods of different sizes and ages are wandering
around in a conifer forest. One of the big ones goes up to a redwood
AND WALKS ITSELF UP THE SIDE TO A REARING POSITION, and then the tree
falls over. Sequoias have nortoriously shallow root systems. Sequoia
californica(George?), the coastal one is always falling on roads in
the winter during high winds. Wouldn't a multi-ton animal leaning
heavily on the base of one of those things knock it over? Then all
the shorter and younger saurapods scramble up to the end they can now
reach while the tall one goes back to browsing what it can reach
without knocking trees over.
(I've been off line while the net at work has been down)