code: from imageio import imread
  import matplotlib.pyplot as plt
  
  
  def plot_animal_tree(ax=None):
      import graphviz
      if ax is None:
          ax = plt.gca()
      mygraph = graphviz.Digraph(node_attr={'shape': 'box'},
                                 edge_attr={'labeldistance': "10.5"},
                                 format="png")
      mygraph.node("0", "Has feathers?")
      mygraph.node("1", "Can fly?")
      mygraph.node("2", "Has fins?")
      mygraph.node("3", "Hawk")
      mygraph.node("4", "Penguin")
      mygraph.node("5", "Dolphin")
      mygraph.node("6", "Bear")
      mygraph.edge("0", "1", label="True")
      mygraph.edge("0", "2", label="False")
      mygraph.edge("1", "3", label="True")
      mygraph.edge("1", "4", label="False")
      mygraph.edge("2", "5", label="True")
      mygraph.edge("2", "6", label="False")
      mygraph.render("tmp")
      ax.imshow(imread("tmp.png"))
      ax.set_axis_off()
  
apis: matplotlib.pyplot.gca