There is no way to know whether this large flying dragon-like creature is indigenous to the polar regions of the Girl Genius universe or if it is a construct made by the Polar Ice Lords. Wooster [ describes] [[Chronology - Volume #|✣ ]] the one appearing in the strip as being "one of the last" of its kind, says wurms make good hunters (despite an evident lack of eyes) and implies that its activities are limited by climate and/or season. It is able to fly while carrying at least three people and a humanoid clank on its back.