Sunday is Monkey Covers day here at YACB. Because there's nothing better than a comic with a monkey on the cover.
From 1965, Carmine Infantino draws the cover of Detective Comics #339, with Batman fighting the Living Beast Bomb, a gorilla with a bomb strapped to its chest!
(Standard disclaimer about terrorist gorillas not really being monkeys applies.)
Image courtesy of the GCD. Click on the image for a larger version.