Sunday is Monkey Covers day here at YACB. Because there's nothing better than a comic with a monkey on the cover.
Titano is real on Curt Swan and Stan Kaye's cover to 1960's Superman #138, a cover that was recently featured on Showcase Presents: Superman vol. 2.
(Standard disclaimer about giant apes with Kryptonite vision not really being monkeys applies.)
Image courtesy of the GCD. Click on the image for a larger version.