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Specialization of Collections

I want to make my own specialized/extended collection.
Which class should be selected as superclass of my collection class?

The class constructed from Collection<T> is a useful starting point

A class Animal.
A class AnimalFarm - a subclass of Collection<Animal> - testing protected members.
A sample client of AnimalFarm - revealing use of protected Collection<Animal> methods.
Output from sample client of AnimalFarm.