The Streeler is a giant snail that is native to Africa, but has been successfully bred by wizards in Europe, Asia and North America.
The Streeler changes colour on an hourly basis, and leaves behind a trail of venom so toxic that it burns all vegetation that it touches. It is kept as a pet by those who enjoy its Kaleidoscopic colour changes. Streeler venom is one of the few known substances that can kill Horklumps.
The "poisonous orange snails" seen in the Magical Menagerie in 1993 may have been Streelers.