Scientific name: Bat with Small Wings (Linnai, 1758)

English name: blue whale

Alias: razor whale, whitefin whale

Description: It is the largest animal in the world, with a streamlined body, a wider head than other baleen whales, a flat upper jaw and a longitudinal ridge from the snout to the breathing hole. The dorsal fin is small and located at about 1/4 behind the body. The flippers are very long and the ends are very sharp. The caudal fin is large and has a notch at the rear edge. There are 55 ~ 88 ventral sulcus, which extend to the back of umbilicus. The body color is dark blue and gray, with silver-gray stripes and white spots all over the body. The inside of flippers is white. There are 270 ~ 395 baleen plates on each side. The baleen plate is longer than the width, and the length is 90 ~ 1 10 cm.

Size: The average adult body length is 25m for males and 26.2m for females, and the weight is 100 ~ 120 tons. The largest recorded individual in Antarctica is 33 meters long and weighs 160 tons.

Ecology: Blue whales do not congregate in large groups, usually traveling alone or with females, and gather in different degrees during the foraging period. Migrate from north to south regularly every year, swim to high latitude waters as bait in summer, and swim to low latitude waters in winter to breed. When swimming, a very small dorsal fin is exposed, when breathing, the fog column is as high as 9 meters, and when diving, the caudal fin is exposed to the water. At sexual maturity, the female body length is about 22 meters, and the male body length is 2 1 meter. Every 2 ~ 3 years 1 baby, the pregnancy is about 12 months, and each baby 1 baby. This newborn calf is about 7 meters long and weighs about 2500 kilograms. The lactation period is 7 ~ 8 months, and the calf length can reach 12.5 ~ 14 meters when weaned. The food is mainly krill in planktonic crustaceans.

Distribution: China sea area is extremely rare, and it has been recorded in the Yellow Sea and South China Sea.