Are they vegetarians? Because blue whales are classed as a “Protection Stock” by the International Whaling Commission, trading their meat is illegal, and the kill is an infraction that must be reported. ), and that Soviet whalers did not distinguish between B. m. indica and B. m. brevicauda despite catching thousands of each. To accommodate such hefty structures, the snout has to be arched. In addition, the ovaries of female blue whales form a permanent record of the number of ovulations (or perhaps pregnancies), in the form of corpora albicantia.  Vocalizations have been recorded north near Diego Garcia in May–July, in the Mozambique Channel in November–December and Madagascar Basin south of La Reunion Island in March–June, southwest of Amsterdam Island in December–May, off Crozet Island in December–June. The purpose of vocalization is unknown, but songs produced only by males appear to have a sexually related purpose, while “D-calls” and other non-repeating calls are produced during feeding by both sexes. The average lifespan of a blue whale is about 35 to 40 years. Aside from cleaning krill from the plates in its mouth, the blue whale tongue weighs about as much as an elephant, or a daily car. Baleen is similar to bristles and consists of keratin, the same substance found in human fingernails, skin and hair.  The deepest confirmed dive from a pygmy blue whale was 1,660 ft (506 m). The blue whale stranded on the beach at the mouth of the Vasse River., Busselton.  Southall et al.  They can consume 34,776–1,912,680 kJ (~480,000 kilocalories) from one mouthful of krill, which can provide up to 240 times more energy than used in a single lunge. The pygmy subspecies, B. m. brevicauda  is found in the waters off Indonesia, Australia, Madagascar, and New Zealand.. Blue whales have long, slender mottled grayish-blue bodies, although they appear blue underwater. Sightings in the Gulf of St. Lawrence peak late August-early September and tagging suggests they migrate as far south as the Mid-Atlantic Bight coastal from Delaware to North Carolina and South Carolina. It then filters out tiny marine creatures through a special comb-like structure in its mouth called baleen. It beats just four to eight times a minute – the Slowest heart rate for a mammal, 6: The tail flukes are 7.6 m (25 ft) wide – nearly as long as a London double-decker bus. Blue whale, (Balaenoptera musculus), also called sulfur-bottom whale, the most massive animal ever to have lived, a species of baleen whale that weighs approximately 150 tons and may attain a length of more than 30 metres (98 feet). Catches of Antarctic blue whales (345,775 whales) reduced the population from 239,000 (95% CI=202,000–311,000) in the 1920s to a low of 360 (150–840) animals in the early 1970s, which is 0.15% (0.07–0.29%) of pre-exploitation levels. To accommodate such hefty structures, the snout has to be arched.  D calls are produced by both sexes during social interactions while foraging and may considered multi-purpose contact calls. The Blue Whale (Balaenoptera musculus) grows up to 33 metres (110 feet) in length and weighs 200 tons or more in weight. Specimen measurements indicate that a blue whale measuring 21.6 metres (71 ft) in length had a vestigial mammary slit of 40.6 centimetres (16.0 in) width and 48.2 centimetres (19.0 in) length, with a penis measurement of 1.83 metres (6.0 ft). Once they find a suitably sized ball of krill, they'll lunge forward with mouth open to scoop up as much as possible. What is size and length of a Blue whale? 2. The maximum speed of a blue whale while being chased or harassed has been reported at 20 to 48 km/h (10–25 knots)..  In New Zealand, blue whales and pygmy blue whales may be seen in Kaikōura on the South Island between July and August..  The most recent analysis estimates that the Balaenopteridae family diverged from other families in the late Miocene, between 10.48 and 4.98 million years ago. In 2020, during a 23-day survey, scientists from the British Antarctic Survey (BAS) detected a population of 55 blue whales near a sub-Antarctic island of South Georgia. A foraging whale lunges into a swarm of these shrimp-like animals, accelerating to high speed with its mouth open at a right angle. The most reliable age estimations are from ear plugs. A blue whale heart is the size of a Mini Cooper and can weigh close to 2,000 pounds (~907 kg). Blue whales can best be found off Reykjavík and Húsavík in Iceland from May to August. In the Southern Hemisphere, blue whales can be seen in Gulf of Corcovado between Guaitecas Archipelago, Chiloé Island, and the Chilean mainland, and off the west coast of Chiloe Island from December through March. , Using the number of earwax lamina deposited in the earplug and development of sexual organs from dead whales, it has been determined blue whales reach sexual maturity at about 10 years old and at an average length of 23.5 m for female Antarctic blue whales. Because the two animals are often feeding together, it makes sense that a … The blue whale’s long and slender body can be various shades of grayish-blue dorsally and somewhat lighter underneath. A blue whale subspecies was 65 ft long and upwards of 200 tons or small creatures, about. Survey, only a couple of animals have been well studied off Reykjavík and in! 152 ] [ 153 ] [ 110 ] the International whaling Commission database! 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