If you have to the shot gun, you have a few different ways of shooting down the zombies.
If you aim for its head and shoot, POW, headless zombie. If you aim for a zombie's leg,
you can shoot their legs off or blow them in half if you aim for the zombies mid-section.
If you blow their lower section, be careful, the top half will crawl at you.
meet the Mutant creature in the Police Station, Aim low and shoot it. Two or three hits at
close range with the shotgun will do the trick.