<p>Another 86 dolphins were found dead on Tuesday on an island off the coast of the southern African nation of Mozambique, the cause still unknown, the country's environment ministry said.</p>.<p>Dolphins had already been discovered dead on Sunday at the same location, and total of 111 marine mammals have been found by the authorities.</p>.<p>"The team from Bazaruto Archipelago National Park in Inhambane province found 86 lifeless dolphins on the west coast of Bazaruto Island," a ministry statement said.</p>.<p>The archipelago is located in the Mozambique Channel, between the Mozambican coast and Madagascar.</p>.<p>An investigation is underway to determine the cause of their deaths, with researchers not finding any injuries or suspicious substances in their digestive systems, the authorities said.</p>.<p>The protected waters of the national park are home to dolphins, whales and dugongs in addition to 180 species of birds, among other animals.</p>
<p>Another 86 dolphins were found dead on Tuesday on an island off the coast of the southern African nation of Mozambique, the cause still unknown, the country's environment ministry said.</p>.<p>Dolphins had already been discovered dead on Sunday at the same location, and total of 111 marine mammals have been found by the authorities.</p>.<p>"The team from Bazaruto Archipelago National Park in Inhambane province found 86 lifeless dolphins on the west coast of Bazaruto Island," a ministry statement said.</p>.<p>The archipelago is located in the Mozambique Channel, between the Mozambican coast and Madagascar.</p>.<p>An investigation is underway to determine the cause of their deaths, with researchers not finding any injuries or suspicious substances in their digestive systems, the authorities said.</p>.<p>The protected waters of the national park are home to dolphins, whales and dugongs in addition to 180 species of birds, among other animals.</p>