[tsigel]

function Animal () {
  console.log('new Animal');
}

Animal.prototype.run = function () {
   console.log('animal runing');
};
 
function Beaver () {
   Animal.apply(this, arguments);
   console.log('new Beaver');
}

Beaver.prototype = new Animal();

Beaver.prototype.constructor = Beaver;

Beaver.prototype.run = function () {
   console.log('beaver runing');
};
 
function Deer () {
  Animal.apply(this, arguments);
  console.log('new Deer');
}

Deer.prototype = new Animal();

Deer.prototype.constructor = Deer;

Deer.prototype.run = function () {
   console.log('deer runing');
};

var deer = new Deer();
var beaver = new Beaver();
deer.run();
beaver.run();