Hideous Zippleback

Description
A Zippleback? Exotic. Two heads, twice the status.

-Hiccup, in How to Train Your Dragon

The Hideous Zippleback is a large Mystery class dragon( formerly Fear class) that appears in the Httyd franchise. It is described as incredibly tricky, stealthy, and unusual. Their most striking trait is the pair of heads. One head breathes gas and the other produces a spark to light it. The Zippleback can also use its gas to obscure themselves from being seen.

These species of dragon can also lock together with the rounded spikes on their necks and body. While tumbling they light themselves on fire and squash foes like a flaming boulder. (This ability was seen in How to Train Your Dragon 2.)

Behavior
Both heads have different personalities, and often disagree with each other. Sometimes the two heads fight over which way to go, resulting in them both wanting to go in seperate ways. This can be problematic for the dragon, as if they can't decide where to go they'll be slow and vulnerable.

Despite being mean to the other head, Hideous Zipplebacks are very social among other Zipplebacks.

The best way to train a Zippleback is to feed both heads fish, and then keep them entertained by playing with them. Another way to train a Zippleback is to save its life. Once you do that, the Zippleback will be loyal until it can repay its debts.