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On Mon, 8 Mar 1999, Ronald Orenstein wrote:

> I am still curious to hear why this is so when all other ratites (tinamous
> excepted) have greatly reduced wings unsuitable for brooding.

One possibility might be that the enlarged area available for brooding--in
ostriches this excess brooding area allows for a surplus of eggs to be
placed in the major hen's nest--made feather-brooding unneeccessary.
Small birds may indeed need extra insulation that large ratites did not.