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In page European dragon:

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Though a winged creature, the dragon is generally to be found in its underground lair, a cave that identifies it as an ancient creature of earth.[citation needed] Dragons have been mentioned in European literature since antiquity. In some accounts, the hero Sigurð defeats Fáfnir by digging a pit and then lying in wait, piercing his heart with a sword as he passes overhead and slaying him. This concept is also seen in various other dragon stories. In many portrayals of the European dragon, it is shown as a greedy beast who wanted wealth and other valuables. This includes the prominent dragons in Germanic mythology, Fáfnir and the killer of Beowulf.[2]