After a few attempts to update this mod to 1.19+, I am giving up :( those new versions are too different from 1.16, especially in parts of code that are difficult and unfun.

Feel free to take source code from GitHub if you need it - I am abandoning this mod and minecraft modding.

Minecraft zombies really should be improved.

And this mod improves them.

What you will get by installing this mod?

Multiple variants of humanoid zombies, with different faces, voices and special abilities;
Animal zombies;
Zombie virus that will kill you and turn into zombie in 3 days unless you find a cure;
Very flexible spawn and loot configuration for most zombies;
Improved AI - zombies will find you by loud sounds or placing/breaking light sources;
Feral mode - zombies will attack not only players and few other mobs, but, instead, any non-undead entity
Structures that are dangerous, but rewarding to explore. Expect unexpected! (Currently 1.16.5 only)