STUART WILSON / SCIENCE PHOTO LIBRARY STUART WILSON / SCIENCE PHOTO LIBRARY
Desert Blister Beetles (Lytta magister), Anza Borrego State Park, California. These beetles secrete an organic chemical called cantharidin when disturbed. This substance causes blisters and was used in over-the-counter wart remedies. They are found in the Mojave and Sonoran Deserts in California and elsewhere.
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