Comment
The example involving caged hens is unlikely to involve any kind of group selection for 'goodness'. See: Aarssen, L.W. (2008) Group-selection for ‘goodness’? An account of chickens, a comparison with plants, and implications for humans. Open Evolution 2: 41-43.
The pdf can be downloaded from:
http://www.bentham.org/open/toevolj/openaccess2.htm
posted by Lonnie Aarssen
December 22, 2008