Jack Hanna on Letterman 2011-09-27
Jack Hanna and His Friends on David Letterman
Jack Hanna On David Letterman Show 9 May, 2013
Jack Hanna on The Late Show with David Letterman (July 31st, 1987)
a Giant Owl Attacks Jimmy Fallon and Jeff Musial - Screams like a litlle girl
Bill Murray - Letterman - 2015.05.19
Lettermans Greatest Moments - Dave at Taco Bell
Baby Cheetah, Giant Tortoise & a Reindeer w/ Jack Hanna