Amphibians
Sonoran Desert Toad
Incilius alvarius · also called Colorado River toad, Sonoran Desert toad
The Sonoran Desert toad is the biggest toad in the United States and one of the most chemically loaded amphibians in North America. The glands in its skin produce a mix of heart poisons and a powerful psychedelic, and that combination has made it the subject of an urban legend, a hazard to dogs, and — increasingly — a target for the drug trade.
Overview
The Sonoran Desert toad lives in the Sonoran Desert and nearby arid country of southern Arizona, southwestern New Mexico, and northwestern Mexico. It spends most of the year underground in burrows, emerging only during the summer monsoon to feed heavily and breed explosively in rain pools. It is a voracious carnivore, eating almost any animal it can swallow, including other toads and small lizards.
The chemistry
Its parotoid and leg glands secrete bufotoxins — cardiac poisons — together with 5-MeO-DMT and bufotenin, potent psychoactive compounds. The secretion can poison or kill a dog that mouths the toad, and if dried and smoked by a person it is strongly hallucinogenic.
The “licking” myth
You cannot get high by licking the toad — that mainly delivers the heart poisons, causing an abnormal heartbeat, seizures, and potentially death. The psychoactive route, which emerged in the late 20th century, is to collect and dry the secretion and vaporise it.
A drug-trade target
Surging interest in 5-MeO-DMT, recreationally and in clinical research, has spread “bufo” ceremonies worldwide and created a market for wild toads, which are collected, milked, and often released injured or killed. Given the toad’s small range, narrow breeding window, and slow maturity, this is a genuine conservation threat — and 5-MeO-DMT can be synthesised without any toad.
Danger to pets
Dogs that bite a Sonoran Desert toad can be poisoned within minutes — drooling, red gums, disorientation, abnormal heart rhythm, seizures — and it can be fatal without fast treatment. Cases spike during the monsoon.
Status
The Sonoran Desert toad is Least Concern but declining — extirpated in California and of concern elsewhere in its US range — from habitat loss, road mortality, and now collection for the drug trade.
Sonoran Desert Toad: common questions
Can you really get high by licking this toad?
No — and trying is dangerous. The "toad licking" idea is largely an urban legend and a confusion of two different things. The Sonoran Desert toad's skin secretion contains 5-MeO-DMT, which is a powerful hallucinogen, but it also contains cardiac bufotoxins and other compounds that are toxic if swallowed or absorbed through the mouth, causing racing or irregular heartbeat, seizures, and, in enough quantity, death. Licking the toad delivers the poisons along with everything else. The route people actually use is to collect the secretion, dry it, and smoke or vaporise it, which changes the chemistry — but this involves harming the toad and carries its own serious risks.
What is 5-MeO-DMT and why is it a problem for the toad?
5-MeO-DMT is a fast-acting, extremely potent psychedelic tryptamine, structurally related to the DMT found in some plants. Interest in it, both recreationally and in clinical research on depression and PTSD, has grown sharply since the 2010s, and "bufo" ceremonies using toad-derived secretion have spread worldwide. This has created a market for wild Sonoran Desert toads, which are collected from the desert, squeezed to express their glands, and often released injured, kept in poor conditions, or killed. Because the toad has a limited range, breeds only in a narrow monsoon window, and takes years to mature, this harvest is a real conservation threat, and scientists and Indigenous groups in the region have called for it to stop, pointing out that 5-MeO-DMT can be synthesised in a lab without any toad.
Is the Sonoran Desert toad dangerous to pets?
Yes, seriously. Dogs that pick up or bite a Sonoran Desert toad can be poisoned within minutes by the bufotoxins absorbed through the mouth and gums, showing drooling, bright-red gums, pawing at the mouth, disorientation, a very fast or abnormal heart rhythm, seizures, and collapse. Without prompt treatment — rinsing the mouth out and veterinary care — it can be fatal, especially for smaller dogs. In southern Arizona, toad poisoning of dogs spikes during the summer monsoon when the toads are active. Owners are advised to keep dogs leashed and away from water at night in toad season.
How does the toad survive in the desert?
Like the spadefoot toads it shares the desert with, it spends most of the year underground, sheltering in rodent burrows or self-dug chambers to escape the heat and dryness, in a near-dormant state. It emerges only during the summer monsoon, when heavy rain fills temporary pools. Then it feeds heavily and breeds explosively over a short period — males gather at pools and call, the eggs are laid in long strings, and the tadpoles develop fast before the pool dries. Outside that window the toad is essentially invisible.