The Sonoran Desert toad, also known as the Colorado River toad or Incilius alvarius, is a large amphibian native to the Sonoran Desert region of the southwestern United States and northwestern Mexico. This toad can grow up to 7 inches in length and is characterized by its smooth, olive-green skin and prominent parotoid glands, which secrete a potent toxin. These toads are primarily nocturnal and are most active during the rainy season, when they emerge to breed in temporary pools. Their diet consists mainly of insects and other small invertebrates. The toxin produced by the toad has been used in traditional medicine and is also known for its psychoactive properties, leading to its controversial use in some cultures.