Can We Get a Rhinoceros?

A young boy is eager to have a pet. But not just any pet will do. He wants a RHINOCEROS. Mom has questions in the hopes of making her son realize what a far-fetched idea it is to have such a large beast to take care of:

Where would you keep it?
Where would you keep its food? And
How would you get rid of all the poo he poops?

Then, if not a rhinoceros, how about a whale? a tiger? Or even a blue-footed booby? Mom finally makes a suggestion for a more suitable pet. What could it possibly be?