Sunday is Monkey Covers day here at YACB. Because there's nothing better than a comic with a monkey on the cover!
Dr. Zaius will not let the humans escape with the ape's secret on the cover to Adventures on the Planet of the Apes #5 (1977) by Rich Buckler & Klaus Janson.
(Standard disclaimer about militaristic apes of the future not really being monkeys applies.)
Image courtesy of the GCD. Click on the image for a larger version.