Threadtail

The Threadtail is a Strike class dragon that first appeared in How to Train Your Dragon 2. Its name was revealed in Rise of Berk.

Description
Don't touch! This dragon can secrete a poison through its skin when it senses danger. The only problem is the Threadtail is allergic to it too! It spends most of the day rolling around in Dragonberry bushes to relieve the itching.

Dragon Appearance
This dragon seems to always have bright colors such as bright pink and purple, deep blue with bright green or pale blue with bright yellow. The reason for this colorful appearance is most likely the same as the reason behind the poison dart frogs' bright colors: to warn predators of its poisonous skin. The Threadtail also has a large round frill at the back of its head, and this frill is outlined with round spines which gives it a very crown-like appearance, and it is the same kind of spines can be seen on this dragons nose and running down its neck and back. This dragon's overall body shape seems to be most similar to that of the Thornridge.

Trivia

 * The Threadtail's design was used for the Hobblegrunt in School of Dragons.
 * The ability to secrete poison through its skin is similar to the poison dart frog.
 * The Threadtail is the third dragon to have a head frill, the first being the Hobblegrunt and the second being the Thornridge.
 * The Threadtail was created using a modular system to mix and match preset body parts onto different dragons. It was created from the same base that was used for the Hobblegrunt, Windstriker, Thornridge, Raincutter and two other unknown dragons.