We recommend these Web sites for those interested in the subjects shown on the program. All links are valid as of April 21, 2000. Whooper swans navigate by the sun. This site tracks the journeys of a dozen migratory species each spring.
Some animal migrations remain mysterious.
Cambridge University Press, 1993. Sierra Club Juveniles, 1994. Academic Press, 1997. Orchard Books, 1997. Beyond Words Publishing, 1994.