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