Back in the day, hunters used to imitate the call of male deers in order to attract females. Today, it's more of a hobby - and a competition at Europe's largest hunting fair, "Jagd & Hund," in Dortmund. Contestants use plastic pipes, snail shells or ox horns to bellow. Competitors not only have to imitate the call of a young deer, but also the deeper, angrier one of older deer. The best call wins.