Mutations

mutants buff the Zombie stats,the more mutants a zombie have,the better the stats are.

in zombie farm 1
in the original zombie farm getting mutations were slightly different that zombie farm 2.You had to plant crops nearby the zombies to get a chance of getting a zombie with mutations.Buying a mutant monolith will make it 100% chance.You cannot plant mutanted zombies.

zombie farm 2
in zombie farm 2 you could buy mutanted zombies for Gold.The other way is to combine zombies with the zombie pot.