Return of the Blue Whales‏

Return of the Blue Whales
After decades away, the giant marine mammals have been spotted in the waters off Alaska
By Suzanne Zimbler

Blue whales living in the Pacific Ocean used to travel north toward Alaska for food every spring. But around 1966, the giant mammals stopped making the trip north. Now, after more than 40 years, scientists say blue whales are returning to the northern waters.
Blue Whales' Blue Tale
Blue whales are the largest animals on the planet. The average blue whale is about 80 feet long. That is twice the length of a large yellow school bus. But being huge has not kept these animals safe from harm.
In the early part of the 20th century, an estimated 350,000 blue whales swam the world's oceans. Then whalers began hunting the animals for their blubber. Blubber is a thick layer of fat under the whale's skin that is boiled down to make oil. The animals were hunted almost to extinction. In 1931 alone, more than 29,000 blue whales were killed.
Hunting blue whales was banned in 1966. But recovery has been slow. According to the American Cetacean Society, there are now between 8,000 and 14,000 blue whales in the world. About 2,000 blue whales live in the Pacific Ocean, off the coast of California.
A Whale of a Trip
For decades, blue whales living in the Pacific Ocean have not swum north. "No one had seen blue whales in these waters since the end of whaling," says scientist Jay Barlow. Then, in 2004, three blue whales were spotted in the waters off Alaska. Scientists compared pictures of these animals with pictures that had been taken of blue whales in the waters off the coast of California. They realized that at least one was a match. The same blue whale that had been photographed near California was now swimming near Alaska. Researchers now have evidence that 15 blue whales seen off the coast of Canada and in the Gulf of Alaska are part of the California group of 2,000 animals.
Scientists believe the animals may be traveling north in search of food. Blue whales eat four tons of krill, a tiny shrimplike animal, every day. A change in ocean temperature, which normally occurs every 10 years, may have pushed the krill farther north. "When the food dries up, these animals wander over enormous ranges," said Bruce Mate, director of the Marine Mammal Institute at Oregon State University.

Michael-The blue whales are the biggest animal in the world. They live at the same place that walruses live. The blue whales are getting lesser and lesser. They are almost extinct. Because of the global warming and human killing they are endangered. We should protect them. Don’t let them extinct.