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weighs as much as 20 elephants but lives beneath the sea. The blue is Earth's largest animal. Larger than the largest of ancient dinosaurs, blue s can grow to be more than 100 feet (30 meters) long and weigh nearly 150 tons. Not all s are so large. The much smal ....

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.... remain year-round in the same habitats, where they find their preferred food. The present-day distribution and abundance of some species has been greatly influenced by the commercial whaling industry. rs eliminated or greatly reduced the numbers of some species of baleen s in certain oceanic regions where s once frolicked in abundance. This is particularly true in parts of the Arctic Ocean and the eastern North Atlantic Ocean, where the blue was almost completely exterminated in the early 1900s. Some species of s, however, are numerous today in the Arctic and Antarctic regions. The skin of s is usually black, gray, black and white, or all white ....