Challenge exercise The text of the giveBirth methods in Fox and Rabbit is very similar. The only difference is that one creates new Fox objects and the other creates new Rabbit objects. Is it possible to use the technique illustrated with canBreed to move the common code into a shared giveBirth method in Animal? If you think it is, try it out. Hint: The rules on polymorphic substitution apply to values returned from methods as well as in assignment and parameter passing.
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