4. Observation of Marine Mammals and River Dolphins using AUVs and Acoustic Systems ( Bio Sonar) 2006 Periodical: Research to make archives of recording data of marine mammals and river dolphins Apr.2006: Acoustic observation of a Ganges river dolphin that had been preserved at Budhabalanga river in Orissa state of India Jan. -Feb. 2007: Using newly developed acoustic system, observation of Irrawaddy dolphins in Chilika lagoon in Orissa state of India to develop long-term automatic monitoring system Feb.2007: Acoustic observation of Ganges river dolphin in Ganges river at Narora to develop a more sophisticated robust acoustic system for Ganges river dolphin survey Ganges river dolphin experiments in Budhabalanga river A Ganges river dolphin in Budhabalanga river Ganges river dolphin's typical click Ganges river dolphin's Spectrum     The cross array system developed for Irrawaddy dolphin observations Construction of Water base in Chilika Lake Water base in Chilika Lake Monitoring of Irrawaddy dolphins at Land base   Ganges river dolphin's Observations at Narora Base camp for Ganges river dolphin's Observations