Answer:
What has a horn but does not work?
A nutcracker up in a tree
I am a bird but I cannot fly. I'm the fastest runner of all birds. What am I?
What creature starts yellow inside and white outside, then becomes its first five before becoming the whole?
What has armor but is not a knight, snaps but is not a twig, and is always at home even on the move?
What is so fragile that saying its name breaks it?