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How is it possible to create an object from the abstract class?
System.Array myIntArray = Array.CreateInstance(typeof(int),10);

Array a = Array.CreateInstance(typeof(int), 10); //create some array
Type type = a.GetType(); // type is int[], which is not abstract
Type baseType = type.BaseType; // baseType is Array

abstract class Animal
{
    public static Animal CreateInstance(AnimalType animalType)
    {
        if (animalType == AnimalType.Cat)
            return new Cat();
        if (animalType == AnimalType.Dog)
            return new Dog();
        // etc.
    }
}