I am curious if there are any studies that have shown that within a species a
population did separate itself off by becoming very specialized in their
feeding behavior and thus became a distinct species. I know that most species
are the result of geographical separation, but what are the chances that a
geographical separation could have been caused by prey specialization? (It
probably makes more sense that the geographical isolation preceeded the prey
specialization.)

Jim Rosso
Sammamish
jlrosso at aol.com
http://birdcentral.net/index.htm