Sunday is Monkey Covers day here at YACB. Because there's nothing better than a comic with a monkey on the cover!
Dagar battles a monstrous gorilla in the Forest of Fear on the cover of Dagar the Invincible #12 (1975) by George Wilson.
(Standard disclaimer about monstrous gorillas not really being monkeys applies.)
Image courtesy of the GCD. Click on the image for a larger version.