Alarm Calls in Wild Capuchin Monkeys
The center also studies the alarm calls of wild Capuchin monkeys in Ometepe, Nicaragua. Capuchin monkeys produce alarm call relative to the predator Previous surveys show two distinct families of alarm calls - those dealing with terrestrial predators and those dealing with aerial predators. Alarm calls focused on human threats fall into the aerial category. A sample of over 1500 alarm call vocalizations from a group of previously unstudied wild Capuchin monkeys were recorded on Ometepe island in Nicaragua during the summer of 2008. The calls were analyzed for spectral peak frequencies and onset durations and compared with previously published data of Capuchin alarm calls. The results reveal no significant difference between the terrestrial alarm calls analyzed in the published accounts and the human predator calls recorded in Nicaragua. The results also show a significant difference between the human predator alarm calls in Nicaragua and the aerial alarm calls in the published data. This suggests a geographic variation in the genetic based alarm calls of Capuchin monkeys.
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