Seems he wore out his welcome at Discovery. Keep in mind that Discovery has almost no informative programming on anymore, just WWE type "reality" nonsense. At least Bear was entertaining, even though his show was a pile of dung. It was better dung.

http://www.tmz.com/2012/03/13/man-vs-wild-bear-grylls-fired-discovery-channel/#.T1-t9hx69ZY
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No, I am not Bear Grylls, but I stayed at a Holiday Inn Express last night and Bear was there too!