Whale weighs as much as 20 elephants but lives beneath the sea. The blue whale is Earth's largest animal. Larger than the largest of ancient dinosaurs, blue whales can grow to be more than 100 feet (30 meters) long and weigh nearly 150 tons. Not all whales are so large. The much smaller pilot whale grows to about 28 feet (8.5 meters) in length. And dolphins, which belong to the whale family, range only from 3 to 13 feet (1 to 4 meters). Although whales spend their lives in the sea, they are, like humans, warm-blooded mammals. After a baby whale is born, it nurses on its mother's milk, just like the young of land mammals. Whales are members of the order Cetacea, along with dolphins, porpoises, and the narwhal. There are two basic types of living cetaceans: baleen, or whalebone, whales of the scientific suborder My....

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