Exactly what you fucking think it is. Zombie. Zoo. Animals. Thanks to The Asylum, for going where no film has gone before.
It starts when the capuchin monkeys come down with a nasty virus, turn into zomb-onkeys and go beserk. Of course, they escape and start zombifying the rest of the zoo population. Zombie giraffes tearing folks limb from limb should be horrifying, but I just couldn't stop laughing. The one truly horrifying "zoombie" was the Koala. Koalas are just so cute and so...chill. Zombie Koalas are NOT cute and definitely NOT chill.