Whales, dolphins and porpoises are a group of marine mammals collectively known as cetaceans. Scientists estimate that there are approximately 90 species of cetacean. This distinctive and charismatic group includes the largest animal that ever lived and the longest-lived mammal. Some cetacean species demonstrate highly developed methods of.. Whales are fully aquatic, open-ocean animals: they can feed, mate, give birth, suckle and raise their young at sea. Whales range in size from the 2.6 metres (8.5 ft) and 135 kilograms (298 lb) dwarf sperm whale to the 29.9 metres (98 ft) and 190 tonnes (210 short tons) blue whale, which is the

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Blue whale, a species of baleen whale, a cetacean, that is the most massive animal ever to have lived. Weighing approximately 150 tons, it may attain a length of more than 30 meters (98 feet). Blue whales are predominantly blue-gray animals whose lower surfaces are lighter gray or white.. Antarctic blue whale D-calls. Blue whale D-calls recorded from a sonobuoy deployed in the northern Ross Sea and sped up 4× to raise the pitch to be audible to people. D-calls are thought to be 'social' calls made by male and female whales on feeding grounds. D-calls are highly variable across individual whales and across seasons and years.