Yeah, Jack Hanna can seem a little too willfully clueless, and yeah, he's on Letterman what seems like every other week, but by god, he and Dave have a good thing going, and I just can't hate the guy — after all, he let me bottle-feed a rare baby Bengal tiger back in 1996 when I was a cub reporter for a national entertainment magazine. Anyway, last night, Hanna — the director emeritus of the Columbus Zoo — choreographed a parade of creatures onto the Late Night stage, including some sort of monkey — a guenon — with a love of grooming and a seeming distaste for girls. In fact, if the monkey's manhandling of Letterman's microphone is any indication, we think it's pretty clear where the little guy's gender sympathies lie. Clip above.