To Note: There is some discrepancy between the Dragon info card and The Incomplete Book of Dragons, versus the "Viking Dragons and there Eggs" info sheet.
Squealers are strange slug-like creatures, with dark coloring. They only have forelimbs that have extremely long claws. Their wings are only vestigial and cannot fly.
Squealer eggs are exactly the same size, shape, and consistency as rabbit poop, but with an extra long nail growing out the top.
Squealers are so lazy they have developed an interesting method of stunning their prey by screaming. Squealers have no legs, so lie on their backs and gently wave their extremely long nails in the air. The moment anything touches their up-right nails, the Squealers let out a piercing shriek that can stun its victim, or even kill smaller animals. The Squealers then rapidly devour the dead or stunned creature, stripping it to the bone in 60 seconds.
Squealers are not trained per se, but are utilized by humans. These slimy dragons only move if it's life or death situation. Due to the Squealers' squealing, Vikings use them as a living alarm system.
Squealers and their eggs make an appearance in this reference book.
- Squealers in the Hero's Guide to Deadly Dragons on the Official How to Train Your Dragon Books Website.