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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 17 Great White Bear
- Season 17 The Secret World of Sharks and Rays
- Season 17 American Buffalo: Spirit of a Nation
- Season 17 India, Land of the Tiger: Tiger's Domain
- Season 17 India, Land of the Tiger: Sacred Waters
- Season 17 India, Land of the Tiger: Unknown Seas
- Season 17 India, Land of the Tiger: Desert Kingdom
- Season 17 India, Land of the Tiger: Mountains of Gods
- Season 17 India, Land of the Tiger: Monsoon Forests
- Season 17 John Denver: Let This Be a Voice
- Season 17 Serengeti Stories
- Season 17 Iceland: Fire and Ice
- Season 17 Walking with Giants: The Grizzlies of Siberia
- Season 17 Extraordinary Cats
- Season 17 The Seedy Side of Plants
- Season 17 A Conversation with Koko
Nature - Season 17 Episode 16 A Conversation with Koko
8.10 53 minutes Profiling the 28-year-old lowland gorilla Koko, who communicates by sign language with her mentor, Francine Patterson. Koko, who understands English, has “a good sense of humor,” says Patterson, and “a strong sense of self.” She's also seen painting and watching TV, and playing with male gorillas Michael and Ndume at Patterson's Gorilla Foundation in Northern California.
