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The adaptation of animal echolocation in toothed whales distinguishes them from fully aquatic archaeocetes and early baleen whales. The presence of baleen in baleen whales occurred gradually, with earlier varieties having very little baleen, and their size is linked to baleen dependence (and subsequent increase in filter feeding).
Cetacea (/ s ɪ ˈ t eɪ ʃ ə /; from Latin cetus 'whale', from Ancient Greek κῆτος () 'huge fish, sea monster') [3] is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises.
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
The primitive cetaceans, or archaeocetes, first took to the sea approximately 49 mya and became fully aquatic by 5–10 million years later. [7] The ancestors of toothed whales and baleen whales diverged in the early Oligocene.
Archaeoceti ("ancient whales"), or Zeuglodontes in older literature, is a paraphyletic group of primitive cetaceans that lived from the Early Eocene to the late Oligocene 1] Representing the earliest cetacean radiation , they include the initial amphibious stages in cetacean evolution , thus are the ancestors of both modern cetacean suborders ...
Just this month some 200 pilot whales stranded themselves on. There's a tiny tip of sand at the very northern tip of New Zealand's southern island called Farewell Spit. It is lovely and remote.
Wind versus whales: How dead whales became the symbol of a political battle in NJ and elsewhere. A humpback whale lunge-feeding on schooling fish known as menhaden in the waters of Raritan Bay.
According to federal data, more than 30 whales have been found washed up along the eastern shore since Dec. 1, with over a dozen of them off the coast of New York and New Jersey. To get a sense of ...