.elephant-poaching-rbl.tmp.nlogo

globals [ max-age circle-size female-maturation-age ]
turtles-own [ age gender ]

to setup
  clear-all

  set max-age 50  ;; elephants live up to 50 years old
  set circle-size 25  ;; bigger means smaller circles
  ask patches [ set pcolor brown + 4.9 ]  ;; create background with color 39.9 (brown 35+4.9)

  create-turtles initial-number-elephants [  ;; create agent I with properties

    ;; initial value for every agent
    set gender "male"
    set color red
    set shape "circle"
    set xcor random-xcor set ycor random-ycor
    set age random max-age
    set size age / circle-size  ;; circle size grows with age

    ;; initial gender distribution is 50%
    if random 2 = 1 [
      set gender "female"
      set color green
    ]

    age-class  ;; create an age distribution

  ]
  reset-ticks
end

to age-class
  ;; to create an age distribution
  ;; calf (<1 year old), juvenile (1-5 years old), subadult (5-15 years old), adult (>15 years old)

end

to go
  ;; increase age and adjust size
  ask turtles [
    set age age + 0.25  ;; each step represent 3 months/a quarter of a year
    set size age / circle-size
  ]


  ;; give birth
  ;; adult elephant will give birth every 6 years

  if gender = "female" and age mod 6 = 0 [

    ;; default offspring value
    let offspring-gender "male"
    let offspring-color red

    ;; create female offspring
    if random 2 = 1 [
      set offspring-gender "female"
      set offspring-color green
    ]

    ;; female elephant give birth to a baby elephant
    ;; with age 0 and properties as declared above
    hatch 1 [
      set age 0
      set xcor random-xcor set ycor random-ycor
      set gender offspring-gender
      set color offspring-color
    ]  ;; / hatch



  ]  ;; / if

  ;; die naturally from old age
  ask turtles [
    if age > max-age [ die ]
  ]

  tick

  ;; each step represent 3 months/a quarter
  ;;
  if ticks = period * 4 [ stop ]

end
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TEXTBOX
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39
Simulation of Illegal Poaching of Sumateran Elephant using Agent-Based Modeling
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@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
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