A smuggler who filled his trousers with rare snakes was caught when he landed at Prague airport because customs officers spotted them wriggling.The man had pulled his trousers tight tying them with string and tucked the legs into his socks after hiding the snakes inside. But his appearance alerted customs officers who arrested the man when he landed in the Czech capital after a flight from Africa. The 23-year-old man was also found to have scorpions and beetles in his luggage, local media reported.