In the last four decades, dugong (Dugong dugon) aggregations have been rarely reported from the geographically isolated, vast seascape of the Andaman Islands, India.

Mass strandings of beaked whales (family Ziphiidae) have been reported in the scientific liter-ature since 1874. Several recent mass strandings of beaked whales have been reported to coincide with naval active sonar exercises. To obtain the broad-est assessment of surface ship naval active sonar operations coinciding with beaked whale mass strandings, a list of global naval training and anti-submarine warfare exercises was compiled from openly available sources and compared by location and time with historic stranding records.

The Indo-Pacific humpback dolphin (Sousa chinensis, Osbeck, 1765) is found in coastal waters throughout the Indian and western Pacific Oceans, but the species has not been studied in detail along the coast of India. Records of stranded specimens, occasional sightings, incidental catches, and museum specimens are reviewed here, and these show that humpback dolphins occur along most Indian coastal areas and in northwest Sri Lanka.