Answer:
What kind of fish chases a mouse?
The ones in the sea are prickly, but the ones on the street might pickpocket you.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I'm best when I am toast.
I am covered in quills for protection. What am I?
I hop along and have a pocket where I keep my babies. I live in Australia. What am I?
What made Cyclops quit teaching?