To find out where dragon legends could have come from, Harrison goes on a quest to find the biggest, dragon-iest reptiles in the world.

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The Big Question: "Do dragons exist?" 1) MY GREAT CHALLENGE: How can snakes move without legs? To find out, challengers squeeze into “snake suits,” then race to wriggle their way to the finish line. 2) IN THE FIELD: At a reptile zoo, Harrison handles real-life crocodiles and meets a cousin of the fearsome Komodo dragon.