Zombie Class abilities:
*Full-time duck
*Small (hard to shoot it)
*Fast (hard to catch and avoid it)
*Have headcrab model.
Some information before use:
This zombie class is not compatible with bots, and it will never be. If bot selects this class, he's class will be automatically changed to main class. So make sure, that this class is not first in your zombie class list (I'm talking about putting this class before zp_zclasses40.amxx). If you need to do this, change this line value from 0 to other(1, 2 etc):
(line 46) zp_set_user_zombie_class(id, 0)
Seccond, class speed must be set much more than normal ~(normal speed * 2.35). This is not a problem, you can set it what you want.
Have fun.
This plugin has no bugs(or if found one, please tell me

). Except one thing. After server start change map or restart server. It fix the problem, that crab don't have speed as set.
Code:
2010-04-19 - v1.1 Code improvement, bug fixes
2010-04-20 - v1.2 Fixed duck bug, when converting to nemesis from headceab.