What Are The Different Groups Of Marine Mammals?
There is some discussion over how many groups of marine mammals there are. Some organizations say four; others say five. They all include the same mammals, so I wanted to research what these are. NOAA recognizes four different groups: cetaceans (whales, dolphins, and porpoises), pinnipeds (seals, sea lions, and walruses), sirenians (manatees and dugongs), and marine fissipeds (polar bears and sea otters). The Marine Mammal Center separates …