Craig, You can report this to : [log in to unmask] I believe this is a study out of Chicago. I reported several last year. There are at least 4 colors used , green, blue orange , red. See ya, Greg Cudworth ______________________________________________________________________ Ohio-birds mailing list, a service of the Ohio Ornithological Society. Our thanks to Miami University for hosting this mailing list. Additional discussions can be found in our forums, at www.ohiobirds.org/forum/. You can join or leave the list, or change your options, at: http://listserv.muohio.edu/scripts/wa.exe?LIST=OHIO-BIRDS Send questions or comments about the list to: [log in to unmask]