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Re: Earliest land tetrapods had problem swallowing

> As has been pointed out in the very recent literature, these trackmakers 
> don't need to have been tetrapods or even other tetrapodomorphs. In very 
> shallow water, lungfish walk -- I think it was Nature where the paper and the 
> video were published last year.

Indeed.  In fact, some simple math will show that in very shallow water, 
assuming motion isn't continuous, walking on the bottom is more efficient.


--Mike H.

> I don't know if I'm already allowed to talk about what happens when you take 
> a bichir (*Polypterus*, an actinopterygian) out of water.