The Four-toed Whiptail (Teius teyou) or Teyu is one of the most common South American teiid lizards. It is found from southern Brazil to Argentina. It lives in open land, and often takes cover in rocky areas. It will make a tunnel for itself under dirt and rocks to hide from enemies. It feeds on insects and spiders.
- Teius teyou, The Reptile Database
- Longmann's animal encyclopedia