vv

breed [trees tree]
breed [lumberjacks lumberjack]

to setup
  clear-all
  reset-ticks

  ask patches [ set pcolor 33 ]

  create-trees 150 [
    set shape "tree"
    move-to one-of patches
    set color green
  ]

  create-lumberjacks 5 [
    set shape "person lumberjack"
    move-to one-of patches
  ]
end 

to go
  ask lumberjacks [
    move
    if any? trees-here [
      ask trees-here [ die ]
    ]
  ]
  tick
end 

to move
  left random 90
  right random 90
  fd 1
end