Hideous Zippleback

A Hideous Zippleback (Elapsisodracus Serpentinii) is an extinct species of quadrupedal dragon that lived in what is now Norway, Finland, and Sweden. They were thought to be Monstrous Nightmares at first glance, but it turns out they are a completely different species with different body plans. Hideous Zippleback also was once thought to have two heads and tails, but it was actually due to a mated pair of Hideous Zipplebacks standing side-by-side, which made knights thought they were seeing one animal with two heads and tails. Along with the Deadly Nadder, Hideous Zipplebacks were among the only known dragons with only four limbs, probably due to some of their mutations disappearing from their ancestors. Due to their body plans and wings, they most likely walked in a similar fashion to a modern day vampire bat.ft

Extinction
Like all dragons, they most likely went extinct due to habitat loss and the fact that human vikings and knights killed them after they hunted livestock.

However, along with other dragons, Hideous Zippleback are said to be still alive today due to sightings continuing, but they remain as cryptids.