Blue whales were hunted hard for fat and oil. Especially during the 70 years of the 20th century, it is estimated that around 500,000 blue whales were killed whale population around South Georgia in the South Atlantic, killing a genocide. Including those who have been living off the coast of Japan. Some blue whale population decline of 93 percent until well into the plight of endangered creatures. Until the mid-1950s, it has conserved more seriously.
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