When the summer monsoon rolls into Tucson, a team of veterinarians and wildlife researchers headed south on Interstate 35 to study a colony of Sonoran desert toads at the University of Arizona’s Desert Laboratory on Tumamoc Hill. Led by Kansas State University veterinarian Gretel Tovar‑Lopez, the group is performing the first systematic neurological exams on this iconic desert amphibian.
Why toad health matters
Toads, a type of frog, sit near the base of the food chain. They keep insect populations in check and serve as prey for snakes, birds and mammals. Because their skin is semi‑permeable, toads absorb chemicals from their environment, making their health a reliable barometer of ecosystem condition. Declining numbers can signal climate change, pollution or emerging disease.
From pet check‑ups to field research
Veterinarians use a detailed checklist—much like a human medical history—to record a toad’s age, origin, diet, housing and any symptoms. Physical exams cover everything from nose to hind‑quarters, and specialists check heart rate with a Doppler monitor, the same device used to listen to a fetus’s heartbeat. “We always wear gloves,” says zoological veterinarian Krista Keller of UC Davis, noting that gloves protect both the animal and the handler.
For the neurological portion, researchers apply gentle pressure to a toad’s foot and observe reflexes. Tovar‑Lopez discovered that Puerto Rican crested toads withdraw their foot, while Sonoran desert toads do not—a clear species difference. She also observed distinct personalities, with some toads demanding a break and others pressing on without hesitation.
Protecting toads and the public
Beyond scientific curiosity, the work has practical implications. Some people attempt to lick or smoke toad toxin for hallucinogenic effects, a practice the National Park Service warned against in 2022. “Licking toads is dangerous for humans, pets, and the toads themselves,” warns Robert Villa, community outreach assistant at the Desert Laboratory.
By establishing what is neurologically normal for healthy toads, veterinarians can better diagnose disease versus trauma, such as fungal infections that cause limb weakness. The research also informs pet owners who keep toads as long‑lived companions—some can live 30 to 40 years.
Looking ahead
The team plans to expand testing to additional desert amphibian species, creating a baseline of health data that could serve as an early warning system for environmental threats across the Southwest.
Original reporting: Arizona Luminaria — read the source article.
