Ostriches... Re: kudu runners

Marc Verhaegen wrote:

only a complete idiot believes that you evolve heavier bones to run over
savannas

Running does indeed result in higher bone density.

when you compare people like you sitting on a chair with athletes yes

not when you compare normal cursorials with erectus:

Erectus - and modern humans - are not four footed creatures.

There is a better creature to compare with...

http://animals.howstuffworks.com/birds/ostrich-info.htm/printable
...
The males, slightly larger than the females, reach a weight of about 300 pounds
(135 kg).
...
Ostriches can attain a speed of 45 miles per hour (72 km/h).
...

Here's what two legged running does to the legs

http://www.americanheadhunters.com/jpg/Ostrich-Leg.jpg

http://www.nhc.ed.ac.uk/images/vertebrates/birds/Ostrich.jpg
.

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