where can I find a CD on North American Birds?

Answer 1

Try: Birding by Ear: Eastern and Central North America (Peterson Field Guides(R)) (Audio CD)
by Richard K. Walton, Robert W. Lawson, Roger Tory Peterson (Series Editor) Amazon carries this and other CDs in the same series, or it may be available to your local Audubon Society store. You will need a slightly different version (also available on Amazon) for western birds.