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Dolphins can recognize prey by using the broadband sonar signals. The echo from the fish contains components resulting from multiple reflections, for example, the swimbladder and body surface of the fish. It is necessary for identification of fish species to estimate the positions and amplitudes of these reflections. In this paper, we analyzed the echo from the fish by using the sonar signal of the...
Chinese river dolphin (Lipotes vexillifer), usually called 'baiji', is one of the most endangered mammals in the world. The preservation of these mammals directly ensures the health of the ecosystem. However, not much behavioral information on baiji is available so far, that could effectively assist in undertaking their preservation. This research is an attempt to reveal baiji's hitherto unknown underwater...
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