extinct about 11 million years ago, in the middle Miocene, an explosion of other toothed whales, including the belugas, narwhals, beaked whales, and porpoises, emerged. The dolphins, part of the same shift, made the biggest splash of all. Delphinidae are the largest, most diverse and most widespread of all the cetaceans, representing 36 species currently surviving, including dolphins, pilot whales, and killer whales. All of them possess some form of echolocation capacity, and all are carnivorous
