<canvas id="popChart" width="600" height="400"></canvas>

var popCanvas = document.getElementById("popChart");

Chart.defaults.global.defaultFontFamily = "Lato";
Chart.defaults.global.defaultFontSize = 18;

var popData = {
  datasets: [{
    label: ['Deer Population'],
    data: [{
      x: 100,
      y: 0,
      r: 10
    }, {
      x: 60,
      y: 30,
      r: 20
    }, {
      x: 40,
      y: 60,
      r: 25
    }, {
      x: 80,
      y: 80,
      r: 50
    }, {
      x: 20,
      y: 30,
      r: 25
    }, {
      x: 0,
      y: 100,
      r: 5
    }],
    backgroundColor: "#FF9966"
  }]
};

var bubbleChart = new Chart(popCanvas, {
  type: 'bubble',
  data: popData
});