Answer:
They are toothy nocturnal immortals.
What goes up and down without moving?
Where can you find roads without cars, forests without trees and cities without houses?
What can get you there in eco style, pushed by your legs mile after mile?
What do people spend a lot of money on every year but never want to use it?
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?