For all of you interested in this thread, you may want to get a hold of
this paper:

Flood, N.J. 1989. Coloration in New World Orioles. Behavioral Ecology
and Sociobiology 25:49-56.

I have not read it myself yet, but I think that is related plumage
patterns to behaviour.

Al Jaramillo
jaramill at sfu.ca
Vancouver, B.C.