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RE: Unidirectional gator breathing in Science

>> Speculation -- It may be that birds and other animals w/ an
>> "avian-style" respiratory system aren't as vulnerable to
>> breathing problems created by high external pressure on the
>> body combined w/ a lower pressure of the air in the
>> breathing passages, versus animals w/ a "mammalian-style"
>> system.
> What did long-necked plesiosaurs do, I wonder? Did _Elasmosaurus_ have to 
> stick its entire neck out of the water just to gulp some air?
 maybe they parked just a foot or two under the surface, and exposed only the 
nostrils and top of their head to the air?   (avoiding the snorkel, but not 
totally exposed)
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