Enough with the acid-spitting, goo-puking, back-humping zombies. This bird fanatic uses his zombie crows to bring even more chaos in the chaos. The crows cause massive distraction and little bits of damage which adds up over time. Since it's a big flock of birds, the survivors will have a hard time killing them.
So far, I like 1 and 7 the most, but I'll keep on thumbnailing till I get the design down the way I want it.