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