I share John McLouglin's apparent skepticism of Rob's claims, so I've got to ask Rob (i.e. Robert.J.Meyerson@uwrf.edu) for some defense of the following statement: > When a part of an animal evolves some kind of offensive purpose, it > usually is for intraspecies combat first. Thanks, -- Mickey Rowe (rowe@lepomis.psych.upenn.edu)