Great Plains Toad
The skin is covered with many small warts. Unlike other true toads in Missouri, the Great Plains toad has a raised hump (known as a “boss”) between the eyes. The blotches on the back and sides are large, dark brown or green, paired, and outlined with white or tan. The belly is cream-colored. Makes a loud, chugging sound—"chee-ga, chee-ga, chee-ga"—that lasts 20-50 seconds.