😃😃Blue whale😃😃
ABOUT IT
Reaching a maximum confirmed length of 29.9 meters (98 feet) and weight of 173 tones (190 tons),[3] it is the largest animal known to have ever existed.[4] The blue
There are currently five subspecies of blue whale, recognized by the Society for Marine Mammalogy's Committee on Taxonomy: B. m. musculus in the North Atlantic and North Pacific, B. m. intermedia in the Southern Ocean, in the waters off Chile.
There are currently five subspecies of blue whale, recognized by the Society for Marine Mammalogy's Committee on Taxonomy: B. m. musculus in the North Atlantic and North Pacific, B. m. intermedia in the Southern Ocean, in the waters off Chile.
Morphology
A blue whale lifting its tail flukes
The mottling pattern is highly variable and the unique pigmentation pattern along the back in the region of the dorsal fin can be used to identify known individuals. Additional distinguishing features of the blue whale include a broad, flat head, which appears U-shaped from above; 270–395 entirely black baleen plates on each side of their upper jaw; 60–88 expandable throat pleats; long, slender flippers; a small (up to 13 inches (33 cm)) falcate dorsal fin positioned far back toward the tail; a thick tail stock; and a massive, slender fluke.
The mottling pattern is highly variable and the unique pigmentation pattern along the back in the region of the dorsal fin can be used to identify known individuals. Additional distinguishing features of the blue whale include a broad, flat head, which appears U-shaped from above; 270–395 entirely black baleen plates on each side of their upper jaw; 60–88 expandable throat pleats; long, slender flippers; a small (up to 13 inches (33 cm)) falcate dorsal fin positioned far back toward the tail; a thick tail stock; and a massive, slender fluke.
BLUE WALE
The blue whale is the largest known animal. In the International Whaling Commission (IWC) whaling database, 88 individuals longer than 30 m . The Discovery Committee reported lengths up to 102 ft (31.1 m, the longest scientifically measured (e.g., from rostrum males’ Hydrodynamic models suggest that a blue whale could not exceed 108 ft (33 m) due to metabolic and energy constraints.
The blue whale is the largest known animal. In the International Whaling Commission (IWC) whaling database, 88 individuals longer than 30 m . The Discovery Committee reported lengths up to 102 ft (31.1 m, the longest scientifically measured (e.g., from rostrum males’ Hydrodynamic models suggest that a blue whale could not exceed 108 ft (33 m) due to metabolic and energy constraints.
Life span
Blue whales secrete earwax (cerumen) throughout their lives. Each chronologically deposited light and dark layer (lamina) indicate a switch between fasting during migration and feeding, and one set is laid down per year, and thus the number of these layers can be used as an indicator of age.
Blue whales secrete earwax (cerumen) throughout their lives. Each chronologically deposited light and dark layer (lamina) indicate a switch between fasting during migration and feeding, and one set is laid down per year, and thus the number of these layers can be used as an indicator of age.
Reproduction and birth
A blue whale calf with its mother
Using the number of earwax lamina deposited in the earplug and development of sexual organs from dead whales has been determined. Another method for determining age at sexual maturity, involves measurements of testosterone from the baleen of male blue whales. Testosterone concentrations measured from baleen suggest that the age at sexual maturity for one blue whale was 9 years.. Female pygmy blue whales are 68.9–71.2 ft (21.0–21.7 m) in length[31] and roughly 10 years old at age of sexual maturity.
Using the number of earwax lamina deposited in the earplug and development of sexual organs from dead whales has been determined. Another method for determining age at sexual maturity, involves measurements of testosterone from the baleen of male blue whales. Testosterone concentrations measured from baleen suggest that the age at sexual maturity for one blue whale was 9 years.. Female pygmy blue whales are 68.9–71.2 ft (21.0–21.7 m) in length[31] and roughly 10 years old at age of sexual maturity.
Evolution
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).
Molecular evidence places blue whales in the Superorder Cetartiodactyla, which includes the Orders Cetacea (under which blue whales are classified) and Artiodactyla, even-toed ungulates. This classification is supported by evidence of morphological homology between cetaceans and artiodactyls in two described archaic whales.
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).
Molecular evidence places blue whales in the Superorder Cetartiodactyla, which includes the Orders Cetacea (under which blue whales are classified) and Artiodactyla, even-toed ungulates. This classification is supported by evidence of morphological homology between cetaceans and artiodactyls in two described archaic whales.
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