breed [humans human]
breed [zombies zombie]

to setup
  ca
  setup-zombie
  setup-human
end

to setup-zombie
  set-default-shape zombies "person"

  create-turtles total-zombies [
      set color green ]
end

to setup-human

  set-default-shape humans "person"

  create-turtles total-humans [
      set color yellow ]
end