Sunday is Monkey Covers day here at YACB. Because there's nothing better than a comic with a monkey on the cover!
Detective Chimp leads the rest of Shadowpact into battle on the cover of Day of Vengeance #1 (2005) by Walt Simonson.
(Standard disclaimer about detecting chimps not really being monkeys applies.)
Image courtesy of the GCD. Click on the image for a larger version.