Blue whale

There may be more than 250,000 blue whale before whaling. However, in the merciless pursuit of the whaling fleet of the 20th century, species were almost wiped out before being protected globally in 1967.

Over 190,000 people died in the Southern Hemisphere from 1904 to 1967. Thousands of people are believed to have been killed by the Soviet fleet in the 1960s and 1970s.

In 1931, at the heyday of whaling, 29,000 blue whales were killed in one season. Only in the 20th century, only about 360,000 blue whale was killed in Antarctica.

The blue whale has a truly global distribution that occurs in all seas except the Arctic Ocean and the closed ocean. However, despite this, they are still one of the rarest whales, between 10,000 and 25,000 people. Most biologists think they are most at risk of a big whale.

In the northeastern part of California's North Pacific, there is only one individual showing signs of recovery, and currently there are about 2,000 animals

Other blue whales belong to a subspecies known as "Gnomish" blue whale. As the name suggests, they are smaller than "real" blue whale. Until recently, they were considered to be limited to the Indian Ocean, but recent research suggests that they may be more general

Blue whale like sea deeper than coastal water. The population moves to the polar in summer and goes into cool water to eat. They move back to the equator in warm water and breed in winter. The end result of these movements is that the northern hemisphere and the southern hemisphere stocks do not mix in the opposite seasons in the northern hemisphere and the southern hemisphere.

Antarctica blue whale is usually larger than other blue whale subspecies. For example, in the North Atlantic and North Pacific, blue whales can grow to about 90 feet, but in Antarctica they reach about 110 feet and weigh more than 330,000 pounds. Like other whale whales, female blue whale is larger than male whale. Blue whale will sail the sea at a speed of usually 5 mph or more, but it may accelerate to over 20 mph per hour with a short burst of time. They are one of the biggest animals on Earth, snoring and snoring. And under good conditions, it is believed that blue whale can hear each other 's voice 1000 miles away. Scientists believe that these vocals can be used not only for communication with their superior hearing but also to navigate the depth of the dark ocean through sonar.

Dwarf Blue Whale was composed of a group of founder of the Antarctica blue whale about 20,000 years ago, before and after the last glacial period. This is probably because the blue whale has been pushed north by spreading the ice layer and since there have been several people since then. Due to the recent evolution of dolphin blue whale, genetic diversity is relatively low. Blue whale has a long narrowed body that is more tense than the longer structure of other whales. The head is flat and U-shaped with protruding ridges extending from the vent to the top of the upper lip. The front of the mouth is a thick whale plate, about 300 sheets each about 1 meter (3.3 feet) in length are hung from the upper jaw, run 0.5 m (20 inches) and return to the mouth. The grooves 70-118 (called ventral folds) extend parallel to the body's length along the throat. These wrinkles help to drain moisture from the mouth after puncture (see Feeding below).