Answer:
John Lennon sang about being this toothy creature.
I'm carried by mad animals. What am I?
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.
My first is in window but not in pane. My second's in road but not in lane. My third is in oval but not in round. My fourth is in hearing but not in sound. My whole is known as a sign of peace. And from Noah's ark won quick release.
What fish came first?
What is so fragile that saying its name breaks it?
Animal
Difficult
Easy
Food
Funny
Kids
Logic
What am I?