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Sauropod Trunks

I just joined this list...
I was wondering what anyone's input on the concept of sauropods having trunks
If you examine a _Brachiosaurus brancai_ skull, you can see deep grooves
coming down from the nostrils to the snout.  This can also be observed in
_Nemegtosaurus_, _Antarctosaurus_, and _Diplodocus_, among others.  Also, what
would be the purpose of nostrils high on the head besides a trunk; we know
that the large sauropods were not highly dependent on water as once thought...
A trunk (or a 'snout', like on a swine) on a sauropod could help it eat more
efficiently and make it easier for the animal to remove vegetation from trees.