Answer:
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
They are toothy nocturnal immortals.
Sally's mom has 5 children, Boby, Jimmy, Franky, Marly. Who is the last child?
You could do this to a motion, see it on a watch, or place this in a race.
It belongs to you, but other people use it more than you do. What is it?
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?