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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 19 Wild Horses of Mongolia with Julia Roberts
- Season 19 The Octopus Show
- Season 19 Extraordinary Birds
- Season 19 The Urban Elephant
- Season 19 Intimate Enemies: Lions and Buffalo
- Season 19 Polar Bear Invasion
- Season 19 Triumph of Life: The Four Billion Year War
- Season 19 Triumph of Life: The Mating Game
- Season 19 Triumph of Life: The Eternal Arms Race
- Season 19 Triumph of Life: Winning Teams
- Season 19 Triumph of Life: Brain Power
- Season 19 Triumph of Life: The Survivors
- Season 19 Baby Tales
- Season 19 The Panda Baby
- Season 19 Golden Seals of the Skeleton Coast
- Season 19 Australia's Little Assassins
Nature - Season 19 Episode 6 Polar Bear Invasion
8.10 53 minutes Each October, the remote Canadian town of Churchill in Manitoba plays host to some very unusual guests. More than a thousand hungry polar bears gather there to await the refreezing of Hudson Bay and then move out on the ice in pursuit of their traditional winter diet of seal. The world's largest land carnivore, polar bears can be very dangerous for humans as well as sea creatures -- but for tiny Churchill, they also are a tourist-dollar bonanza.
