How do I make a dynamic array of pointers to an abstract class in C++?

I have an abstract class of animal.

There are subclasses rat, dog, and cat

I need a dynamic array to store a list of animals and their ages.

Do I go like this?

Rat r;
Dog d;
Cat c;

animal* animalsArray[3];
animalsArray[0]=&r;
animalsArray[1]=&d;
animalsArray[2]=&c;
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