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- Season 0 1970-01-01
- Season 1 1982-10-10
- Season 2 1983-10-09
- Season 3 1984-09-30
- Season 4 1985-10-20
- Season 5 1986-10-19
- Season 6 1987-09-20
- Season 7 1988-10-09
- Season 8 1989-10-08
- Season 9 1990-09-30
- Season 10 1991-09-28
- Season 11 1992-10-05
- Season 12 1993-10-03
- Season 13 1994-10-02
- Season 14 1995-10-08
- Season 15 1996-10-13
- Season 16 1997-10-12
- Season 17 1998-10-11
- Season 18 1999-10-24
- Season 19 2000-10-22
- Season 20 2001-09-09
- Season 21 2002-10-13
- Season 22 2003-10-19
- Season 23 2004-11-07
- Season 24 2005-11-06
- Season 25 2006-10-24
- Season 26 2007-10-28
- Season 27 2008-10-26
- Season 28 2009-10-25
- Season 29 2010-09-26
- Season 30 2011-10-19
- Season 31 2012-10-10
- Season 32 2013-09-04
- Season 33 2014-09-24
- Season 34 2015-09-23
- Season 35 2016-10-12
- Season 36 2017-10-04
- Season 37 2018-10-24
- Season 38 2019-10-02
- Season 39 2020-10-21
- Season 40 2021-10-20
- Season 41 2022-10-19
- Season 42 2023-10-18
- Season 43 2024-10-23
Season 43 Episode
- Season 1 The Flight of the Condor: Ice, Wind, and Fire
- Season 1 The Flight of the Condor: Ocean, Desert, and Thin Air
- Season 1 The Flight of the Condor: Down the Amazon
- Season 1 Amate: The Great Fig Tree
- Season 1 Kopje: A Rock for All Seasons
- Season 1 On the Edge of Paradise
- Season 1 Forest in the Clouds
- Season 1 The Discovery of Animal Behavior: Natural Mysteries
- Season 1 The Discovery of Animal Behavior: In Praise of God
- Season 1 The Discovery of Animal Behavior: Search for the Mind
- Season 1 The Discovery of Animal Behavior: A Question of Learning
- Season 1 The Discovery of Animal Behavior: Signs and Signals
- Season 1 The Discovery of Animal Behavior: Living Together
Nature - Season 1 Episode 11 The Discovery of Animal Behavior: A Question of Learning
8.10 53 minutes First there is a re-creation of Ivan Pavlov's experiments which led to the discovery of the "conditioned reflex." Then we see the investigation by Otto Pfungst of "Kluge Hans" (Clever Hans) a horse whose apparent knowledge of arithmetic was actually response to subtle signals from his trainer. We also see dramatizations of Thomdike's experiments with chicks, Watson's with terns, and B. F. Skinner's famed work at Harvard in the thirties.
