Hatch Example

turtles-own [ age ]

to setup
  clear-all
  ;; create turtles at evenly spaced angles
  ;; and colors in order rather than randomly
  create-ordered-turtles 3 [
    set color pink
    fd 3
  ]
  reset-ticks
end 

to go
  if not any? turtles [ stop ]
  ask turtles [
    wander
    reproduce
    grow-old
  ]
  tick
end 

to grow-old
  set age age + 1
  if age > 50 [ die ]
end 

to wander
  rt random 360
  fd 0.5
end 

to reproduce
  if color = pink and random 5 = 0 [
    hatch 1 [
      if random 10 > 0 [ set color blue ]   ;; 9 of 10 hatched turtles turn blue
      set age 0
    ]
  ]
end 


; Public Domain:
; To the extent possible under law, Uri Wilensky has waived all
; copyright and related or neighboring rights to this model.