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Although it averages about 1.36 m (4.5 ft) in length, this huge worm can reach a length of as much as 6.7 m (22 ft) and can weigh over 1.5 kg (3.3 lb). [239] Only the giant Gippsland earthworm , Megascolides australis , and a few giant polychaetes , including the notorious Eunice aphroditois , reach nearly comparable sizes, reaching 4 and 3.6 m ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
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 narwhal has a robust body with a short, blunt snout, small upcurved flippers, and convex to concave tail flukes. Adults measure 3.0 to 5.5 m (9.8 to 18.0 ft) in length and weigh 800 to 1,600 kg (1,800 to 3,500 lb). [20] [21] [22] Male narwhals attain sexual maturity at 12 to 20 years of age, reaching a length of 3.5 to 4.0 m (11.5 to 13.1 ft).
An adult female is 15 m (49 ft) [14] and can weigh up to 47 tonnes (46 long tons; 52 short tons), [14] with the larger records of 17.5–18 m (57–59 ft) [15] [16] in length and 80 tonnes (79 long tons; 88 short tons) [17] or up to 90 tonnes (89 long tons; 99 short tons) in weight, [18] making them slightly smaller than other right whales in ...
Between 40% and 50% of their body weight is fat, which is a higher proportion than for cetaceans that do not inhabit the Arctic, where fat only represents 30% of body weight. [ 39 ] [ 40 ] The fat forms a layer that covers all of the body except the head, and it can be up to 15 cm (5.9 in) thick.
It can constitute as much as 50% of a whale's body weight. Calves are born with only a thin layer of blubber, but some species compensate for this with thick lanugos. [40] [41] Whales have a two- to three-chambered stomach that is similar in structure to those of terrestrial carnivores.
The fin whale (Balaenoptera physalus), also known as the finback whale or common rorqual, is a species of baleen whale and the second-longest cetacean after the blue whale. The biggest individual reportedly measured 26 m (85 ft) in length, with a maximum recorded weight of 77 to 81 tonnes (85 to 89 short tons ; 76 to 80 long tons ).