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I think it may be on Animal Planet mainly because of their slogan, "surprisingly human," because humans have a huge impact on the world. It could be for other reasons, such as: (please add more)
Treehouse of Horror X was created on 1999-10-31.
Treehouse of Horror XI was created on 2000-11-01.
Treehouse of Horror XIII was created on 2002-11-03.
Treehouse of Horror XII was created on 2001-11-06.
The cast of Treehouse Masters - 2013 includes: CeeLo Green as Himself - Singer Dana Klisanin as Herself - Writer
Treehouse Masters - 2013 Love Is in the Air 1-8 was released on: USA: 19 July 2013
Treehouse Masters - 2013 Levitating Lighthouse 2-5 was released on: USA: 7 February 2014
Treehouse Masters - 2013 Treetop Taphouse 1-4 was released on: USA: 21 June 2013
Treehouse Masters - 2013 Temple of Adventure 2-1 was released on: USA: 10 January 2014
Treehouse Masters - 2013 Canopy Clubhouse 1-7 was released on: USA: 12 July 2013
Treehouse Masters - 2013 View from Above 1-9 was released on: USA: 26 July 2013
Treehouse Masters - 2013 Sky High Spa 1-3 was released on: USA: 14 June 2013
Treehouse Masters - 2013 Wild Butterfly Escape 2-3 was released on: USA: 24 January 2014
Treehouse Masters - 2013 Ultimate Treehouses 2 Evolution 2-6 was released on: USA: 14 February 2014
Treehouse Masters - 2013 Luck O the Irish Cottage 1-2 was released on: USA: 7 June 2013
Treehouse Masters - 2013 Sky High Redwood Retreat 2-4 was released on: USA: 31 January 2014