text: define(['joga', 'text!BirdNest.html', 'BirdView', 'Bird'], function (joga, html, BirdView, Bird) {
      
      function BirdNest() {
          this.title = joga.stringProperty('BirdNest');
          this.views = joga.arrayProperty([]);
          this.element = joga.elementProperty(html);
      }
  
      BirdNest.prototype.hatch = function (bird) {
          this.views.push(new BirdView(bird));
      };
      
      return BirdNest;
  });
  