Leprechauns have also become self-appointed guardians of ancient treasure (left by the Danes when they marauded through Ireland), burying it in crocks or pots. This may be one reason why leprechauns tend to avoid contact with humans whom they regard as foolish, flighty (and greedy?) creatures. If caught by a mortal, he will promise great wealth if allowed to go free. He carries two leather pouches. In one there is a silver shilling, a magical coin that returns to the purse each time it is paid out. In the other he carries a gold coin which he uses to try and bribe his way out of difficult situations. This coin usually turns to leaves or ashes once the leprechaun has parted with it.However, you must never take your eye off him, for he can vanish in an instant.