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The blue whale (Balaenoptera musculus) is a marine mammal and a baleen whale.Reaching a maximum confirmed length of 29.9 m (98 ft) and weighing up to 199 t (196 long tons; 219 short tons), it is the largest animal known ever to have existed.
The pygmy right whale shares several characteristics with the right whales, with the exception of having a dorsal fin. Also, pygmy right whales' heads are no more than one quarter the size of their bodies, whereas the right whales' heads are about one-third the size of their bodies. [11] The pygmy right whale is the only extant member of its ...
Blue whale with calf off the coast of Iceland. The blue whale is the largest living animal in the world in the present epoch. Its summer range extends from the east of Canada to Svalbard, and this range is potentially occupied by two separate groups. [10] Like other rorquals, blue whales appear to migrate further south during the winter.
A thrifty study uncovers a wealth of data about one of the world's largest and most elusive species.
Most toothed whales have no fixed bonds. In many species, females choose several partners during a season. Baleen whales are largely monogamous within each reproductive period. [citation needed] Gestation ranges from 9 to 16 months. Duration is not necessarily a function of size. Porpoises and blue whales gestate for about 11 months.
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More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [ 8 ] [ 9 ] Estimates on the number of Earth's current species range from 10 million to 14 million, [ 10 ] of which about 1.2 million have been documented and over 86 percent have not yet been described. [ 11 ]