What Am I Riddles

Question: Voiceless it cries,
Wingless flutters,
Toothless bites,
Mouthless mutters.

What is it?

Question: I don't like crackers and I don't drink tea. I just want to eat what I used to be.

Question: I am a cave full of bones,
and the house of a worm.

What am I?

Question: You will see me every night sometimes i am scary and sometimes not What am I

Question: Occurring once in a hundred years and once in thousands. But never in a day or a year or a century.