Zombies are stronger but slower than biters. They are an additional enemy to biters and on a different faction.

Zombies:
- Changed graphics to look like zombies
- Stronger
- Slower
- A lot of Zombies spawn around their base.
- They spawn a lot quicker than biters
- They will fight the biters (There is an option to have them on the same force)

Adjustable mod settings:
Zombie Health
Zombie walking speed
Zombie team with biters
Different looks for the Zombie nest
Amount of Zombies that spawn around a nest

My other Zombie mod that replaces vanilla biters https://mods.factorio.com/mod/ZombieHorde

Zombie model by Clint Bellanger
Zombie nest art by Tserup

Thank you MFerrari for your help