Its seems clear now that it refers to plural birds. Don't know whether to be happy or horrified I interpreted it as a complex genetic problem :) Thank you respondents.
As a 5th grader said to me as we watched some Robins; GO BIRDS! Alex Watson ---- Join or Leave mou-net:http://lists.umn.edu/cgi-bin/wa?SUBED1=mou-net Archives:http://lists.umn.edu/archives/mou-net.html
