Deadly Sonoran Desert Toad
Deadly Sonoran Desert Toad During the summer monsoon season, Sonoran Desert Toads (Bufo alvarius) are common, nocturnal visitors to yards near water or natural, desert vegetation here in the Sonoran Desert. They emerge after the summer rains in order to feed and breed in large, temporary rain pools. During the rest of the year, Sonoran Desert Toads hibernate underground. These huge toads like to gorge on insects, especially June Beetles, near outdoor lights or lighted windows and doors. Male Sonoran Desert Toads will also get into swimming pools and then call to attract females. Since they are usually unable to escape from the swimming pool, the Sonoran Desert Toads can be found the next morning, usually still alive, sitting grumpily inside the pool filter compartment waiting to be rescued. Determined and persistent, Sonoran Desert Toads are surprisingly difficult to keep out of your yard because they can squeeze under gates, and I've even observed these wily toads climbing both wire fences and wire mesh snake guards. No matter what I do to keep them out, I still find these toads in my Tucson, Arizona yard every summer. I spotted this greenish Sonoran Desert Toad in my yard in early August of 2007. Sonoran Desert Toads were formerly known as Colorado River Toads, but these large toads are not only found near the southern Colorado River, but also in desert areas (mostly in the Sonoran Desert) from southeastern California, northern Mexico, and through southern Arizona to western New Mexico. Sonoran Desert Toads are olive green to brown in color and have lumpy skin, large glandular lumps on their hind legs, golden eyes with horizontally elliptical pupils, large, poison-filled parotoid glands behind their eye and tympanum (circular external ear), and one or more distinctive white tubercles at the corners of their mouth.
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