Here's what you need when you go in search of the world's largest and fiercest cave animal: a hard hat, wellies, a torch, a bottle of schnapps and a lot of patience. One thing you don't need is anything to defend yourself with. The world's largest and fiercest cave animal is neither very large nor very fierce. Growing to about 25 centimetres long, they are pale, slender and clammy with short, feeble legs, much like a real-life Gollum. They are also virtually blind. So you are more likely die of boredom or cold than come under attack. But what they lack in ferocity, they make up for in strangeness.
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