To commemorate the 5th anniversary of Dave retiring from late night television (his last show was on May 20, 2015), I've put together a series of "first and last" appearances, the latter paying tributes in their own ways to the last giant of late night (h/t Jason Zinoman).
Part 15. Jack Hanna
1. February 14, 1985
2. April 29, 2015
The 2015 guest appearance comes from Andrew Lynch's superb YouTube upload, linked here:    • Video