"Riddle me this, riddle me that, what eats bamboo and looks like a cat?" A bamboo-eating cat of course! If you didn't get that one then you're seriously going to struggle to solve the rest of these mind-boggling riddles. They come from the website Propensity For Curiosity, and they're tough enough to test the resolve of even the most experienced conundrum crackers. So get comfortable, take the phone off the hook, limber up those mental muscles and get ready to concentrate. And no cheating! Although if you're really stumped then you can click on the picture to find the answer.