Are Duck and Goose Levitically Clean Meats?

Do you keep the Levitical/Mosaic health laws regarding clean and unclean food? If so (and perhaps even if not), you have probably heard of the controversy surrounding the swan (and by relation the duck and goose) being an unclean meat. The KJV Bible lists the swan as an unclean bird. However, later translations such as the NKJV have changed this to owl. There remains to this day a debate among Jewish and Christian communities as to which translation is correct and whether or not the swan family