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On Mon, 8 Mar 1999, Ronald Orenstein wrote:

> Except that wing-brooding presumably serves a different function (shelter,
> etc) from brooding with the heat of the body via the brood patch, so the
> two are not equivalent.  

I am unclear about the exact function of the wings in this role.  Isn't it
possible that some birds need the wings to hold in the heat, like an
insulating blanket holds in the heat produced by the body.  For exampel,
can pigeons whose wings are clipped sucessfully incubate a clutch.  One
other thing to keep in mind is that the smaller the bird, generally the
larger the egg/adult size ratio.