Season 0 of Natural World premiered on September 24, 1984.

Season 1 of Natural World premiered on October 30, 1983.

Season 2 of Natural World premiered on May 6, 1984.

Season 3 of Natural World premiered on November 4, 1984.

Season 4 of Natural World premiered on September 15, 1985.

Season 5 of Natural World premiered on October 5, 1986.

Season 6 of Natural World premiered on September 20, 1987.

Season 7 of Natural World premiered on September 18, 1988.

Season 8 of Natural World premiered on October 1, 1989.

Season 9 of Natural World premiered on January 6, 1991.

Season 10 of Natural World premiered on November 24, 1991.

Season 11 of Natural World premiered on January 3, 1993.

Season 12 of Natural World premiered on February 20, 1994.

Season 13 of Natural World premiered on November 27, 1994.

Season 14 of Natural World premiered on January 14, 1996.

Season 15 of Natural World premiered on October 6, 1996.

Season 16 of Natural World premiered on October 19, 1997.

Season 17 of Natural World premiered on October 11, 1998.

Season 18 of Natural World premiered on October 3, 1999.

Season 19 of Natural World premiered on October 8, 2000.

Season 20 of Natural World premiered on October 7, 2001.

Season 21 of Natural World premiered on October 13, 2002.

Season 22 of Natural World premiered on October 12, 2003.

Season 23 of Natural World premiered on October 14, 2004.

Season 24 of Natural World premiered on October 19, 2005.

Season 25 of Natural World premiered on October 18, 2006.

Season 26 of Natural World premiered on April 4, 2007.

Season 27 of Natural World premiered on January 4, 2008.

Season 28 of Natural World premiered on November 11, 2008.

Season 29 of Natural World premiered on October 28, 2009.

Season 30 of Natural World premiered on July 8, 2010.

Season 31 of Natural World premiered on August 1, 2011.

Season 32 of Natural World premiered on July 19, 2012.

Season 33 of Natural World premiered on May 17, 2013.

Season 34 of Natural World premiered on April 11, 2014.

Season 35 of Natural World premiered on February 24, 2015.

Season 36 of Natural World premiered on April 14, 2016.

Season 37 of Natural World premiered on March 20, 2017.

Season 38 of Natural World premiered on March 31, 2018.

Season 39 of Natural World premiered on April 7, 2019.