Polymorphism:
  The ability of one general thing to behave like other specific things.
  In Java, polymorphism can take two forms: method overloading and method overriding.
  Method overloading happens when various methods with the same name are present in a class.
  When they are called they are differentiated by the number, order, and types of their parameters.
  Method overriding occurs when the child class overrides a method of its parent.
    A Deer IS-A Animal
	A Deer IS-A Vegetarian
	A Deer IS-A Deer
	A Deer IS-A Object