Good Riddles

Question: What laughs while stalking prey, but never goes in for the kill?

Question: A farmer has 10 cows, all but six die. How many are left?

Question: What has a lot to say but can't be heard because it can't speak one single word?

Question: Why was the mouse afraid of the water?

Question: Permanent feature and teacher, unless it results in you being buried by the preacher - what is it?