Genus Holbrookia is a group of lizards that are commonly known as earless lizards. They belong to the family Phrynosomatidae and are endemic to North and Central America. These lizards are often referred to by different synonyms, such as Cnemidophorus holbrookia, Holbrook lizard, or Holbrooke's spiny lizard. These lizards typically have a flattened body with a short tail, and their skin is covered in small, spiny scales. They are well adapted to arid and semiarid environments and are known for their ability to burrow in loose soil. Despite their small size, Holbrookia lizards are important predators in their ecosystem and play a crucial role in maintaining the balance of their ecosystem.