The Colorado River toad (Incilius alvarius) is a member of the family Bufonidae, the true toad species. They can grow to lengths of 7.5 inches long and are the largest native toad in the United States. They are found in on the border on Mexico and the United States in Arizona, New Mexico, and California.
The toad is most known for producing 5-MeO-DMT, an hallucinogen. Its the only animal on earth that creates the substance. It also produces Bufotenin, which is also a hallucinogen commonly found in toads. Both drugs are illegal to posses, distribute, buy, or manufacture in the USA. If you aren’t big into the federal government telling you what to do and want to experiment, Bufatenin is toxic that has caused people to be poisoned and die.
(credit to http://www.sublimek9.com/toad.html for the image)