function Bird(name) {

this.name = name;

}

Bird.prototype.flighted = true; // Default for all Birds

Bird.prototype.isFlighted = function () { return this.flighted };

Bird.prototype.getName = function () { return this.name };

function Chicken(name) {

// Chain the constructors

Chicken.superclass.constructor.call(this, name);

}

// Chickens are birds

Y.extend(Chicken, Bird);

// Define the Chicken prototype methods/members

Chicken.prototype.flighted = false; // Override default for all Chickens