Blue whales live in all oceans of the world.
They feed in high latitudes and migrate to the tropics to breed and give birth. Worldwide blue whale population is unknown however, blue whales are considered endangered according to the U.S. Endangered Species Act . Blue whales were hunted extensively for their large quantities of baleen, blubber, and meat. Although blue whales are protected, their populations show few signs of recovery. Female blue whales are generally larger than males, and northern hemisphere blue whales are generally smaller than those in the southern hemisphere.