Acoustic recordings suggest that some individuals may remain on their feeding grounds and on their breeding grounds year-round. See the article whaling.…, …that has ever lived, the blue whale, which reaches a length of more than 30 metres (100 feet) and a weight of 180 metric tons (nearly 200 short [U.S.] tons). in the waters off Chile.  Blue whales have been recorded making 180° rolls during lunge-feeding, allowing them to engulf krill patches while inverted; and they rolled while searching for prey between lunges, which has been hypothesized as allowing them to visually process the prey field to find the densest prey patches. The reported take of all North Pacific blue whales by commercial whalers totaled 9,773 between 1905 and 1977.. Blue whales are formally classified as endangered under the Endangered Species Act and considered depleted and strategic under the Marine Mammal Protection Act.  Although the Western Australia/Indonesia population and the Eastern Australia/New Zealand population are morphologically similar and not genetically separated, there are no photograph-identification matches between the two populations, and mitochondrial DNA haplotype frequencies suggest a high degree of genetic isolation of the New Zealand population.  The Discovery Committee reported lengths up to 102 ft (31.1 m); however, the longest scientifically measured (e.g., from rostrum tip to tail notch) individual blue whale was 98 ft (29.9 m). This is so that it can pump enough blood around its massive body. Being able to grow to lengths of over 100 ft. long and weighing up to 180 tons the blue whale is the largest living animal in the world. Hearing predictions are inferred from anatomical studies, vocalization ranges, and behavioral responses to sound. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. In the 1930–31 season alone the worldwide kill of blue whales exceeded 29,000.  They are generally solitary or found in small groups. Everything about this whale is big.  The northern extent can seasonally overlap with the Central North Pacific population in the Gulf of Alaska.  Chilean blue whales may overlap in the Eastern Tropical Pacific with Antarctica blue whales and Eastern North Pacific blue whales. Blue whales were initially tough to hunt because of their size and speed. , In the Northern Hemisphere, males weigh an average 100 tons (200,000 lb) and females 112 tons (224,000 lb). …whales—fast-swimming species such as the blue whale (, The blue whale mainly devours small reddish shrimp called krill, while the formidable killer whale feeds on salmon, seals, and sharks. Blue whales are known to have a massive body physique; they weigh up to approximately 170,000 kilograms (170 to 200 tonnes).  The maximum age determined from earplug laminae for a pygmy whale is 73 years (n=1133).  They have also been detected as far south as 52°S in summer and in the Tasman Sea and Lau Basin near Tonga in winter, and likely range farther afield in the south-western Pacific. The tongue of a blue whale is the size and weight of an elephant. , Chilean population In summer and fall, Chilean blue whales feed along the west coast of South America, particularly the Chiloense Ecoregion, including the Corcovado Gulf, Pacific and northwest coasts of Chiloé Island, and inner sea of Chiloe Archipelago. , Data from individual satellite tagged Eastern North Pacific blue whales suggest leisurely traveling rates of 4 knots, or 4.6 mph (7.41 km/h), with a minimum average speed of 1.55 ± 1.68 mph (2.49 ± 2.7 km/h). ), and that Soviet whalers did not distinguish between B. m. indica and B. m. brevicauda despite catching thousands of each. 3. The blue whale is a cetacean and is classified scientifically within the order Cetacea as a rorqual (family Balaenopteridae) related to the gray whale (family Eschrichtiidae) and the right whales (Balaenidae and Neobalaenidae) of the baleen whale suborder, Mysticeti. This is comparable to the length of a Boeing 737-600 aeroplane, which is 31 metres (102 feet) in length. The maximum speed of a blue whale while being chased or harassed has been reported at 20 to 48 km/h (10–25 knots).. , Blue whales are rorquals, in the family Balaenopteridae whose extant members include the fin whale (Balaenoptera physalus), sei whale (Balaenoptera borealis), Bryde’s whale (Balaenoptera brydei), Eden's whale (Balaenoptera edeni), common minke whale (Balaenoptera acutorostrata), Antarctic minke whale (Balaenoptera bonaerensis), Omura's whale (Balaenoptera omurai), and humpback whale (Megaptera novaeangliae). 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