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Re: Croc & Tyrannosaur tongues?



Isn't a salt excreting gland useful to enable animals that drink salt water to survive? Otherwise the salt concentrations would kill them.
Frank Bliss
MS Biostratigraphy
Weston Wyoming
On Feb 21, 2005, at 2:54 PM, Dann Pigdon wrote:


Rodlox R wrote:

Esturine (salt-water) crocs also have salt-secreting glands on their
tongues, thus using them for yet another purpose.

it may just be a matter of "making do with what nature leaves them"....but
I'm afraid to ask: _why_ is their glands on their tongues?

I'm guessing it's the only permeable bit of skin that is in contact with
the water (to help flush the excreted walt away). The rest of the outer
body is fairly well sealed off with thick hide and scutes.


There is a species of tortoise here in Australia that also had need for
a permeable bit of skin in contact with the water. It took a very
different evolutionary path - its cloaca has adapted to absorb oxygen a
bit like a primitive gill. That's right - it can 'breath' underwater
through its backside!

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Dann Pigdon
GIS / Archaeologist         http://www.geocities.com/dannsdinosaurs
Melbourne, Australia        http://heretichides.ravencommunity.net/
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