Re: Testing the "why" of Giraffe necks...

[David Marjanovic <david.marjanovic@gmx.at>]

> If the limit of  'head-over-heart' height is the strength of the artery 
> rather than the pressure the heart can generate,

That's an interesting idea. Are there any data on this...?

> a denser atmosphere would therefore allow a longer neck (ie, a greater 
> head/heart height differential).

Of course, but so would anything else that would keep the arteries from 
bursting. I can think of lots of options: increasing the amount of smooth 
muscle around the arteries...