Gail,

I just now had a chance to read the past few days' worth of digest messages.
Maybe I'm too late by now, but (as Jim Lyles wrote), the article you are
looking for probably is:

Ken Kauffman. 1991. A Flicker of recognition: three distinct forms, and
their offspring. American Birds Vol. 45 (5): 1172-1175.

Martin Muller, Seattle
MartinMuller at email.msn.com