Communication and Perception
Vocalizations of Irrawaddy dolphins in captivity within the Mahakam River, Indonesia included a single-component sonar signal, with the majority of frequencies captured at 60 kHz. Pulse trains were consistent with rates repeated at 40 to 60 kHz. Researchers theorize that Irrawaddy dolphins have a narrow sonar field. Little is known or recorded regarding courtship communication or other social signals.
Communication Channels: visual ; acoustic ; chemical
Perception Channels: visual ; acoustic ; ultrasound
- Kamminga, C., H. Wiersma, W. Dudok Van Heel. 1983. Sonar sounds from Orcaella brevirostris of the Mahakam River, East Kalimantan Indonesia. Aquatic Mammals, 10: 83-95.