   setCharacteristicsVisible: (@showCharacteristics) ->
     @_updateVisibility()
 
-  _addListeners: (dragon)->
+  _addListeners: ->
     Events.addEventListener EventTypes.DRAGON.ALLELES_CHANGED, (evt)=>
       if evt.detail.dragon is @dragon
         @_updateClasses()

    @showCharacteristics ?= false
    @visibleTraits ?= []

    @_addListeners(@dragon)
    @div = $(domId)[0]
    @div.classList.add 'dragon-view-parent'
    @_injectHtml()

    @characteristicList.innerHTML = out.join('')

  _updateSexLabel: ->
    return unless @dragon?
    @sexLabel.innerHTML = if @dragon.sex is BioLogica.MALE then "male" else "female"

  _injectHtml: ->
