Pinwheel Vipers are colour-changing serpents from Opal territory.
Doran the Dragonlover described Pinwheel Vipers in Secrets of Deltora.
Pinwheel Vipers seem to be calm, unless stepped upon, this will cause them to immediately attack, aiming for shins or ankles.
Pinwheel Vipers are very thin serpents, about as wide as a human finger, but can be as long as a man's arm. Their colour changes depending on what surface they are on; Doran mentions Pinwheel Vipers that are green, brown, and bright blue, to name a few. The snakes coil in a flat, pinwheel shape, which gives them their name.
Pinwheel Vipers live in the Plains territory alongside numerous other plants and animals. Their exact distribution throughout the territory is uncertain, but Doran has mentioned seeing the snakes near the River Broad, near Brighteyes flowers.
It is unknown what Pinwheel Vipers eat, but the Vipers themselves are occasionally preyed upon by Opal Dragons. Most likely they prey on small animals, such as rats.