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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 21 Tall Blondes
- Season 21 Horse and Rider
- Season 21 Dive to the Abyss
- Season 21 Bloody Suckers
- Season 21 Trail of the Cougar
- Season 21 Under Antarctic Ice
- Season 21 The Reptiles: Alligators and Crocodiles
- Season 21 The Reptiles: Snakes
- Season 21 The Reptiles: Turtles and Tortoises
- Season 21 The Reptiles: Lizards
- Season 21 Lost World of the Holy Land
- Season 21 Leopards of Yala
- Season 21 A Mystery in Alaska
- Season 21 War Wrecks in the Coral Seas
Nature - Season 21 Episode 9 The Reptiles: Turtles and Tortoises
8.10 53 minutes Observing turtles and tortoises, the shelled animals that have been on Earth more than 200 million years. Included: problems they face in the modern world. Howard McGillin narrates.
