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Acousticstructures of sound in Gunnison's prairie dog alarm calls aredescribed, showing how these acoustic structures may encode information aboutthree different predator species (red-tailed hawk—Buteo jamaicensis; domestic dog—Canis familaris;and coyote—Canis latrans). By dividing each alarm call into 25equal-sized partitions and using resonant frequencies within each partition, commonlyoccurring acoustic structures were identified as components of alarm callsfor the three predators. Although most of the acoustic structuresappeared in alarm calls elicited by all three predator species,the frequency of occurrence of these acoustic structures varied amongthe alarm calls for the different predators, suggesting...