The Best of "Jungle" Jack Hanna | Letterman

Jack Hanna Collection on Letterman, Part 1 of 11: 1985-1986

Jack Hanna Bitten by a Beaver - David Letterman December 1988

Jack Hanna's long goodbye: How Alzheimer's is stripping away the man the world once knew

Jack Hannah @ Letterman

Jack Hannah @ The David Letterman Show 2

In His Own Time by Jack Hannah - Songs Of Faith (Solo Album) - Sons of the San Joaquin