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Re: Rex Jaws

Birds have no lips-they have beaks (a condition shared by a great many
dinosaurs, thank you)
Do birds have the muscle attatchments for lips (left over from a lipped
past) or not?

Bird lower jaws are very slim (as a weight reduction probably).  Would a
bird have room in it's jaws to have multiple rows of teeth, much less a
single row?  What kind of tooth row-and-replacement did Archie have?

Do birds have gums and gum tissue since they have no teeth or lips?  (I
know what hawks have under the tongue at least)


Tracy Ford wrote:
> As stated before, mammals have muscles to 'smack' their lips and 'lizards,
> snakes, the tuatara doesn't.

>  I haven't seen them when I've looked at croc
> skulls, perhaps Chris Brochu has a comment?  While on the subject, what
> about the exuberant gum tissue that is seen in most reptiles?  Teeth are
> usually felt more than seen, even long ones.  I suspect the pink sticky
> covering has something to do with continuously replacing teeth, but I
> haven't been able to find anything about it in most basic reptile
> references.  Any help from the experts here?   When I have looked at large
> theropod skulls, the polished and worn area on the teeth seems to begin at
> a distance from the bone, suggesting that gums were probably there.
> Not really. It also suggest a few things, one, the tooth in the skull has
> been displaced, or it's beginning to be pushed out by the incoming tooth.
> Stan has it's teeth nearly falling out (some disagree, but Neil Larson
> agrees) but the roots are still in the maxilla. What you do see is the
> enamel of the tooth, then the root, which is huge in some cases.
> IMHO theropods had crocodilian jaws, no lips but ornithischians had, well, I
> need to do more research and there are a few papers coming out that will
> comment on this by others which will have a great impact on this subject
> (hopefully in the near future).
> Tracy

Flying Goat Graphics
(Society of Vertebrate Paleontology member)