The answer to the animal riddle (which was probably accidently taken from a joke site) is an elephant with extra parts. Here's another good unoriginal riddle: I dig out tiny caves, and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help, yet many people are afraid to let me help them. Who am I?
The riddle answer is dentist. Another riddle: At night they come without being fetched, And by day they are lost without being stolen. What are we?